SADAS

Publications in Refereed International Journals

Quadrupole Effects in the Photoionisation of Sodium 3s in the Vicinity of the Dipole Cooper Minimum
Nishita M.Hosea, Jobin Jose, Hari R. Varma, Pranawa C. Deshmukh and Steven T. Manson
Atoms 2023, 11(10), 125 (2023)
Density functional treatment of photoionization of sodium clusters: effects of cluster-size and exchange-correlation framework
Rasheed Shaik, Hari R. Varma and Himadri S. Chakraborty
Atoms 11 (8), 114 (2023)
Plasmonic Resonant Intercluster Coulombic Decay
Rasheed Shaik, Hari R. Varma, Mohamed El-Amine Madjet, Fulu Zheng, Thomas Frauenheim, and Himadri S. Chakraborty
Phys. Rev. Lett. 130, 233201 (2023)
Modifications in the angular photoemission time delay in Ar@Cq=−160: Coulomb confinement resonance as an amplifier of the spin-orbit-interaction-activated interchannel coupling effect
Afsal Thuppilakkadan, Sourav Banerjee, and Hari R. Varma
Phys. Rev. A 107, 052804 (2023)
Near-threshold Cooper minimum in the photoionisation of the 2p subshell of sodium atom and its impact on the angular distribution parameter
Nishita hosea, Jobin Jose and Hari R. Varma
J. Phys. B: At. Mol. Opt. Phys. 55, 135001(2022)
Confinement enhanced spin-orbit interchannel coupling effect on the atomic photoionization
Afsal Thuppilakkadan, Jobin Jose and Hari R. Varma
J. Phys. B: At. Mol. Opt. Phys. 54 145001(2021)
Photoionization dynamics of Ar trapped in fullerene anion: Coulomb confinement resonances in 2s subshell and its impact on the 3s subshell
Afsal Thuppilakkadan, Jobin Jose and Hari R. Varma
Phys, Scr. 96, 104004 (2021)
Collective effects in photoionization of sodium clusters: plasmon resonance spill, induced attractive force and correlation minimum
Rasheed Shaik, Hari R Varma and Himadri S Chakraborty
J. Phys. B: At. Mol. Opt. Phys. 54, 125101(2021).
Electronic structure and dynamics of confined atoms,
P. C. Deshmukh, J. Jose, H. R. Varma, and S. T. Manson
The European Physical Journal D, 75: Article No.166, 2021
A systematic study of Coulomb Confinement Resonances of atoms trapped inside charged fullerene (A@C q 60).
Afsal Thuppilakkadan, Jobin Jose and Hari R Varma
Phys. Rev. A, 102, 062826 (2020)
Photoionization phase shift and Wigner time delay of endohedrally confined atoms using transient phase methods.
Subhasish Saha, Afsal Thuppilakkadan, Hari R Varma and Jobin Jose
Eur. Phys. J. Plus 135, 753 (2020)
Photoionization dynamics of endohedrally confined atomic H and Ar: a contrasting study between compact versus diffused model potential
Subhasish Saha, Afsal Thuppilakkadan, Hari R Varma and Jobin Jose
J. Phys. B: At. Mol. Opt. Phys 52, 145001 (2019)
Wigner-Eisenbud-Smith photoionization time delay due to autoioinization resonances
P C Deshmukh, A Kumar, H R Varma, S Banerjee, Steven T Manson, V K Dolmatov and A S Kheifets
J. Phys. B: At. Mol. Opt. Phys. 51 (2018) 065008 (8pp)
Wigner photoemission time delay from endohedral anions,
A. Kumar, H. R.Varma, P. C. Deshmukh, S. T. Manson, V. K. Dolmatov and A. S. Kheifets,
Phys. Rev. A 94, 043401 (2016).
Photoabsorption studies of some closed-shell ions in the La isonuclear sequence,
Sindhu Kalyadan, Hari R. Varma, P. C. Deshmukh, J. T. Costello, P. Hayden and S.T. Manson,
Phys. Rev. A 91, 053422 (2015)
Relativistic effects in photoionization time delay near the Cooper minimum of noble gas atoms,
Soumyajit Saha, Ankur Mandal, Jobin Jose, Hari R. Varma, P. C. Deshmukh, A. S. Kheifets, V. K. Dolmatov and S. T. Manson,
Phys. Rev. A. 90, 053406 (2014)
Photoionization of Ca 4s in a spherical attractive well potential: Dipole, quadrupole and relativistic effects,
A. Kumar, H. R. Varma, P. C. Deshmukh and S. T. Manson,
J.Phys. B: At. Mol. & Opt. Phys. 47 185003 (2014).
Pronounced effects of interchannel coupling in high-energy photoionization,
W. Drube,T. Grehk, S. Thiess, G. B. Pradhan, H. R. Varma, P. C. Deshmukh and S. Manson,
J.Phys. B: At. Mol. & Opt. Phys. 46, 245006 (2013).
Photoionization of atomic krypton confined in the fullerene C60,
J. George, H. R. Varma, P. C. Deshmukh and S. T. Manson,
J. Phys. B: At. Mol. Opt. Phys., 45, 185001 (2012).
Controlling x-rays with light: ultrafast transparency,
T. E. Glover, M. P. Hertlein, S. H. Southworth, T. K. Allison, J. van Tilborg, E. P. Kanter, B. Krässig, H. R. Varma, B. Rude, R. Santra, A. Belkacem, and L. Young,
Nature Physics 6, 69(2010).
Hari R. Varma, Marcelo F. Ciappina, Nina Rohringer, Robin Santra,
Above-threshold ionization in the x-ray regime,
Phys. Rev. A 80, 053424(2009).
X-ray-absorption near-edge structure of laser dressed neon,
Hari R. Varma, Lin Pan, Donald R. Beck, Robin Santra,
Phys. Rev. A 78, 065401(2008).
Theoretical and experimental demonstration of the existence of quadrupole Cooper minima,
P. C. Deshmukh, T. Banerjee , H. R. Varma, O. Hemmers, R. Guilllemin, D. Rolles, A. Wolska, S. W. Yu, D. W. Lindle, W. R. Johnson and S. T. Manson,
J. Phys. B: At. Mol. & Opt. Phys. (Fast Track) 41, 021002(2008).
Correlation and relativistic effects on the photoionization of 6s subshell of Hg,
H. R. Varma, Tanima Banerjee, S. Sunilkumar, P.C. Deshmukh, S. T. Manson and V. Dolmatov. Confinement,
Journal of Physics: Conference Series (JPCS) 80, 012025(2007).
Selective interchannel coupling as computational strategy to interpret complex atomic spectrum,
H. R. Varma, T. Banerjee and P. C. Deshmukh
Special Issue of Indian Journal of Physics 81, 1069(2007).
Correlation and relativistic effects on the photoionization of confined atoms,
H. R. Varma, P. C. Deshmukh, V. K. Dolmatov and S. T. Manson,
Phys. Rev. A 76, 012711(2007).
Resonance-induced deviations of beta from 2.0 for rare gas s-subshell photoionization,
S. B. Whitteld, R. Wehlitz, H. R. Varma, T. Banerjee, P. C. Deshmukh and S. T. Manson,
J. Phys. B 39, L335(2006).
Interchannel coupling effects on non-dipole photoionization parameters,
P. C. Deshmukh, Tanima Banerjee, K. P. Sunanda and Hari Varma R
Radiation Physics and Chemistry 12, 2211(2006).
Absolute photoionization cross sections and resonance structure of doubly ionized silicon in the region of the 2p-1 threshold: Experiment and theory,
J. -P. Mosnier, M. H. Sayyad, E. T. Kennedy, J.-M. Bizau, D. Cubaynes, F. J. Wuilleumier, J. -P. Champeaux, C. Blancard, R. Hari Varma, T. Banerjee, P. C. Deshmukh and S. T. Manson,
Phys. Rev. A 68, 052712(2003).

Proceedings in Conferences (refereed)

Photoresponse studies of Ar and K+ confined in neutral and charged fullerenes;
A Thuppilakkadan and H R Varma,
J. Phys. Conf. Ser. 1414 102006 (2020).
Effects of exchange-correlation functionals on the structure and the photoionization dynamics of Na40 versus Na92 cluster
R Shaik, HR Varma, HS Chakraborty
Journal of Physics: Conference Series 1412 (10), 102009(2020)
Inner-shell autoionization resonances along Mg isoelectronic sequence
K. Sindhu, Hari R. Varma, P. C. Deshmukh and S. T. Manson
Journal of Physics: Conference Series 635, 092055 (2015)
Ashish Kumar, H. R. Varma, P. C. Deshmukh, S. T. Manson, V. K. Dolmatov and A. S. Kheifets,
Effect of coulomb confinement resonances on time delay in Ne@C60-5,
Journal of Physics: Conference Series 635 092042 (2015).
Effect of Confinement and interchannel coupling on High-Z atoms
Ashish Kumar, Hari R. Varma, P. C. Deshmukh and S. T. Manson
Journal of Physics: Conference Series 488, 022042 (2014).
Effect of Interchannel Coupling and Confinement on the Photoionization of Kr
J. George , Hari R. Varma , P. C. Deshmukh , S. T. Manson.
J. Phys: Conf. Series 388, 022009 (2012)
Dipole and Quadrupole Photoionization of Intermediate Subshells of Atomic Mercury.
T Banerjee , Hari R Varma , P C Deshmukh , S T Manson.
J. Phys: Conf. Series 388, 022009 (2012)
Core Correlation Effects in the Valence Photodetachment of Cu-
J. Jose, H. R. Varma, P. C. Deshmukh, S. T. Manson, and V. Radojevic' Proc. 26th Summer School and International Symposium on the Physics of Ionized Gases (SPIG 2012), 27th-31st August 2012, Zrenjanin, Serbia,
Book of Contributed Papers & Abstracts of Invited Lectures and Progres
Reports, editors: M. Kuraica and Z. Mijatovic' (University of Novi Sad,
Faculty of Sciences, Department of Physics, 2012), Contributed Paper,pp. 39-42.

Book/ Book Chapters

Autoionization resonances in mercury atom
Sindhu Kalyadan, Hari R. Varma, P.C. Deshmkh,
Electron Collision Processes in Atomic and Molecular Physics: Narosa Publications, ISBN 978-81-8487-343-6, 104-108 (2013) (Book Chapter).
Ashish Kumar, Sindhu Kalyadan, H. R. Varma and P. C. Deshmukh;
Quadrupole effects in the low energy photoionization of the 3s subshell of Mg@C60.
Electron Collision Processes in Atomic and Molecular Physics,
Narosa Publications, ISBN 978-81-8487-343-6, Page no.-168-171(2013) (Book chapter).
Photoabsorption processes in some free and confined atomic systems: Effects of Correlation, Relativistic Interactions and Confinement,
Hari R Varma and P. C. Deshmukh,
Lambert Academic Publishing,Germany, 2011 (Book)

Posters Presented in International Conferenes

Elucidating geometrical features of e-C60 interaction from their elastic scattering spectra
R. Aiswarya, J. Jose, R. Shaik, H. R. Varma, and H. S. Chakraborty
XXXIII ICPEAC, Ottawa, Canada, July 25-Aug. 1(2023)
Angular distribution, spin polarisation and time delay studies of the potassium 4s state in the vicinity of Cooper minimum
N. Hosea, P. Deshmukh, J. Jose, H. R. Varma, S. Manson
XXXIII ICPEAC, Ottawa, Canada, July 25-Aug. 1(2023)
Resonant intercluster Coulombic decay in the photoionization of Na20 confined inside C240
R. shaik, K. Prajapat, H. R. Varma, H. S. Chakraborty
XXXIII ICPEAC, Ottawa, Canada, July 25-Aug. 1(2023)
Quadrupole effects in the photoionization of sodium 3s in the vicinity of dipole Cooper minimum
N. Hosea, P. Deshmukh, J. Jose, H. Varma, S. Manson
Bulletin of the American Physical Society (2023)
Structural analysis of fullerene from e-C60 elastic scattering
J. Jose, R. Shaik, H. Varma, H. Chakraborty
Bulletin of the American Physical Society (2023)
Confinement induced enhancement of photoionization cross-section of an alkali-metal cluster inside a giant fullerene
R Shaik, HV Ravi, H Chakraborty
Bulletin of the American Physical Society, 2022.
Comparative study of plasmon-resonance properties as a function of fullerene size using density functional theory
R Shaik, HV Ravi, H Chakraborty
Bulletin of the American Physical Society, 2022.
Photoionization dynamics of Na 3s in the Cooper minimum region
N Hosea, J Jose, H Varma, P Deshmukh, S Manson
Bulletin of the American Physical Society, 2022.
Geometry driven structures in Na20 photoemission time delays
R Shaik, HV Ravi, H Chakraborty
Bulletin of the American Physical Society 66, 2021
Studies of excited electron decay in photoionization dynamics of Na20 inside C240
HV Ravi, R Shaik, H Chakraborty
Bulletin of the American Physical Society 66, 2021
Exploring the effects of exchange-correlation functionals on the photoionization dynamics of Na = clusters
HV Ravi, R Shaik, H Chakraborty
Bulletin of the American Physical Society 65, 2020
Theoretical Studies of ground state and photoionization dynamics of Na inside C (x=20 and n=240)
HV Ravi, R Shaik, H Chakraborty
Bulletin of the American Physical Society 65, 2020.
Effects of exchange-correlation functionals on the structure and the photoionization dynamics of Na cluster
R Shaik, H Varma, H Chakraborty
Bulletin of the American Physical Society 64, 2019
Photoionisation studies of potassium using multi-configuration methods
N. M. Hosea1, J. Jose, H. R. Varma
13th Asian International Seminar on Atomic and Molecular Physics,
Tata Institute of Fundamental Research & IIT Mumbai, Mumbai, Dec. 3-8, 2018.
Effects of exchange-correlation functionals on the ground state of Nax (x = 8,20 and 40) clusters
Rasheed Shaik, Afsal Thuppilakkadan1, Hari R. Varma, Himadri S. Chakraborty
13th Asian International Seminar on Atomic and Molecular Physics,
Tata Institute of Fundamental Research & IIT Mumbai, Mumbai, Dec. 3-8, 2018
WES time delay across autoionization resonances in krypton,
S. Banerjee, H. R. Varma, G. Aravnd and P. C. Deshmukh
13th Asian International Seminar on Atomic and Molecular Physics,
Tata Institute of Fundamental Research & IIT Mumbai, Mumbai, Dec. 3-8, 2018.
Photoionization dynamics of Ar and K+ trapped inside fullerenes.
H. R. Varma and Afsal Thuppilakkadan.
49th Annual Meeting of the Division of Atomic, Molecular and Optical Physics
(DAMOP 2018) of the American Physical Society, Fort Lauderdale, Florida, USA, May 28 – June 1, 2018.
Time delay in photoionization from confined atoms: A contrasting study of hard Vs smooth jellium model potential.
Hari R. Varma, S.Saha, Afsal Thuppilakkadan, Jobin Jose.
49th Annual Meeting of the Division of Atomic, Molecular and Optical Physics
(DAMOP 2018) of the American Physical Society, Fort Lauderdale, Florida, USA, May 28 – June 1, 2018.
Photoabsorption studies of some closed-shell ions in the La isonuclear sequence,
Sindhu Kalyadan, Hari R. Varma, P. C. Deshmukh, John Costello and P. Hayden
The 11th Asian International conference on Atomic and Molecular Physics, Sendai, Japan, 6-10 October 2014.
Photoionization studies of Cd@C60,
Ashish Kumar, Sindhu Kalyadan, Hari R. Varma, Pranawa C. Deshmukh, Steven T. Manson
The 44th Annual Meeting of the Division of Atomic, Molecular and Optical Physics
(DAMOP 2013) of the American Physical Society, Cuebec city, Canada, 3-7 June 2013.
Sindhu Kannur, Gagan B. Pradhan, Jobin Jose, Hari R. Varma, P. C. Deshmukh and S. T. Manson.
Dramatic quadrupole effects in the low energy photoionization of the 4s subshell of free and confined Ca ,
In The 42nd Annual Meeting of the Division of Atomic, Molecular and Optical Physics
(DAMOP 2012) of the American Physical Society held at Anaheim, California, June 4-8 2012
Jobin Jose, Sindhu Kannur, Ashish Kumar, Hari R. Varma, P. C. Deshmukh and S. T. Manson.
Time delay in photoionization near Cooper minimum, In The 42nd Annual Meeting of the Division of Atomic, Molecular and Optical Physics
(DAMOP 2012) of the American Physical Society held at Anaheim, California, 2012.
Correlation Effects on Cooper Minima in the Photoionization subshells of Free and Confined Atoms,
Hari R. Varma, P. C. Deshmukh, S. T. Manson,
International Workshop on Photoionization (IWP) held at Campinas, Brazil, July 27-31 (2005).
Correlation Effects on Atomic Photoionization Parameters of Confined Calcium and Zinc,
Hari R. Varma, P. C. Deshmukh, S. T. Manson,
35th Meeting of the Division of Atomic, Molecular and Optical Physics
(35th DAMOP) held at U.S.A. May 17 - 21 (2005).
Nondipole Photoelectron Angular Distribution Parameters in Atomic Mercury,
P. C. Deshmukh, T. Banerjee, R. Hari Varma and S. T. Manson,
XXIIIth International Conference on Photonic, Electronic and Atomic Collisions
(XXIIIth ICPEAC) held at Stockholm, Sweden, July 23-29 (2003).
Spin-Orbit Induced Interchannel Coupling in Atomic Photoionization,
P. C. Deshmukh, T. Banerjee, R. Hari Varma and S. T. Manson,
34th Meeting of the Division of Atomic, Molecular and Optical Physics (34th DAMOP) held at Boulder, Colorado, U.S.A., May 20-24 (2003).

Posters/Talks in National Conferences

Jobin Jose, S.Saha, Afsal Thuppilakkadan and Hari R. Varma
Study of correlation effects in ground and excited states of A@C60: Analysis employing Shannon entropy and Coulomb confinement resonances.
Advances In Atomic, Molecular, And Optical Sciences 2020 (AAMOS20), IIT Tirupati, 2020.
Afsal Thuppilakkadan, Jobin Jose and Hari R. Varma.
Photoionization studies of argon inside charged fullerene.
8th Topical Conference of the Indian Society of Atomic and Molecular Physics(ISAMP), IIT Roorkee, March 3-5, 2020.
Photoionisation studies of Hydrogen inside C60 using Guassian Annular square well method.
Afsal Thuppilakkadan, Hari R. Varma, S. Saha, J. Jose and P.C. Deshmukh.
7th Topical Conference of Indian Society of Atomic and Molecular Physics (ISAMP), IISER and IIT Tirupati, January 6-8, 2018
Photoionisation dynamics of Ar@C540,
Sourav Banerjee, Afsal Thuppilakkadan, H. R. Varma, P. C. Deshmukh,
ISAMP TC-7, 6-8 January, 2018, Tirupati,
Eect of model potentials (smooth Vs hard) on the Wigner time delay of H@C60 Photoionisation,
Afsal Thuppilakkadan, Subhasish Saha, Jobin Jose and Hari R. Varma,
ISAMP TC-7, 6-8 January, 2018, Tirupati
Wigner photoionization time delay studies of the neon 2s → np autoionization resonances
Hari R. Varma,
ISAMP TC-7, 6-8 January, 2018, Tirupati.
Role of static polarization of C60 on the photoionization dynamics, Recent Development inthe ultrafast phenomena,
IIT Tirupati on 8th and 9th March, 2018.
Afsal Thuppilakkadan, Ashish Kumar, Hari R. Varma, and P. C. Deshmukh,
Wigner Time delay studies of Ar trapped in giant fullerenes,
21st NCAMP of atomic and molecular physics, PRL Ahmedabad, 03-06 January 2017.
Ashish Kumar, Sindhu Kannur, Hari R. Varma, and P. C. Deshmukh.
Time Delay Study on Xe@C60;
DAE-BRNS Symposium on Atomic, Molecular and Optical Physics IISER Kolkata, 14-17 December 2012.
Sindhu Kalyadan, Ashish Kumar, H. R. Varma, John Costello and P. C. Deshmukh.
Autoionization Resonances in the 6.Xnm Spectral Range;
DAE-BRNS Symposium on Atomic, Molecular and Optical Physics IISER Kolkata, 14-17 December 2012.
Cooper minima in E2 photoionization of xenon,
Gagan Bihari Pradhan, Jobin Jose, Hari R. Varma, T. Banerjee and P. C. Deshmukh, T. C.
on Atomic and Molecular Physics, Sardar Patel Universtiy India, January 3-5(2008).
Some recent studies in the photoionization of free and confined atoms, XV Ith NCAMP,
TIFR, Mumbai, India, january 8-11(2007).
Autoionization resonances in @Kr and @Xe,
Hari R. Varma and P. C. Deshmukh,
XVI NCAMP, TIFR, Mumbai, Jan 8-11(2007).
E1 & E2 photoionization studies of free and confined cadmium and mercury,
Hari R. Varma, S. Sunil Kumar, Tanima Banerjee and P. C. Deshmukh,
XVI NCAMP, TIFR, Mumbai, Jan 8-11(2007).
Confinement effects on E1 and E2 photoionization of the ns subshells of atomic krypton and xenon
T. Banerjee, Hari R. Varma and P. C. Deshmukh,
XVI NCAMP, TIFR, Mumbai, Jan 8-11(2007).
Spin-polarization of Photoelectrons from Atomic Krypton,
Anand Joshi, Saheer Ahmed, H. R. Varma, T. Banerjee,,S. Majumder, Y. Khajuria, P.C. Deshmukh,
NSSA 2006, Calcutta, Jan 18-20 (2006).
Autoionization resonances in atomic Cd using multi channel quantum defect theory,
Hari R. Varma, Tanima Banerjee, Saheer Ahmed, Anand Joshi, Y. Khajuria, S. Majumder and P. C. Deshmukh,
T. C. on Atomic, Molecular and Optical Physics, IACS, Kolkatta, India, December 21-23(2005).
Interference between dipole excitation and ionization channels in confined atoms,
Hari R.Varma, Y. Khajuria, S. Majumder and P. C. Deshmukh,
T. C. on Atomic and Molecular Physics, IACS, Calcutta, Dec 21-23(2005).
Consequences of quantum confinement on atomic photoionization parameters,
Hari R. Varma and P. C. Deshmukh,
XV NCAMP, Physical Research Laboratory, Ahmedabad, India, December 20-23(2004).
Interchannel coupling effects on non-dipole photoionization paramters of atomic xenon and mer- cury,
Tanima Banerjee, K. P. Sunanda, Hari Varma R, Ummal Momeen, P. C. Deshmukh,
XV NCAMP, Physical Research Laboratory, Ahmedabad, India, December, 20-23(2004).
Newly found dynamical effects on photoelectron parameters in the dipole approximation for atomic Xe,
K. P. Sunanda, Tanima Banerjee, Hari Varma R, Ummal Momeen, P.C.Deshmukh,
XV NCAMP, Physical Research Laboratory, Ahmedabad, India, December, 20-23 (2004).