Explanipedia

Relaxation effects in the photoionization time delay near the Cooper minimum of Ar Open

Aarthi Ganesan, Sourav Banerjee, S. Baral, Jobin Jose, P. C. Deshmukh , et al. · 2025

A Review of Block Ciphers and Its Post-Quantum Considerations Open

R Chethana, Jayavrinda Vrindavanam, Suman Roy, P. C. Deshmukh · 2025

Recent advances in cryptography aim to address threats posed by quantum computers. However, these advances have focused disproportionately on asymmetric schemes, while symmetric primitives like block ciphers have received less attention. T…

Synthesis, Spectral Characterization, Thermokinetics and Biological Studies of Co(II), Ni(II), Cu(II), Zn(II) and Zr(IV) Complexes Derived from Hydrazone Schiff Base Open

Prashant Mandlik, P. C. Deshmukh · 2024

Mononuclear Co(II), Ni(II), Cu(II), Zn(II) and Zr(IV) complexes with new bidentate Schiff base ligand 2-hydroxy-N’-(2-oxoindolin-3-ylidene)benzohydrazide (LH2) were synthesized and the complexes were characterized by elemental analysis, IR…

Cooper minima in high-Z atoms: effects of correlation and relativity on np photoionization Open

S. Baral, Jobin Jose, P. C. Deshmukh, Steven T. Manson · 2024

Photoionization dipole transition matrix elements pass through a zero or attain a minimum that leaves imprints on photoionization parameters like the cross-section, angular distribution asymmetry parameter, phase shift, and photoionization…

Attosecond time delay in atomic photoionization: Angular-dependent transition from dipole to quadrupole and spin-flip dynamics Open

Rezvan Khademhosseini, P. C. Deshmukh, Steven T. Manson · 2023

The angular distribution of attosecond Wigner time delay has been investigated including both quadrupole and relativistic effects using the relativistic-random-phase approximation that is based on the Dirac equation and includes significan…

Quadrupole Effects in the Photoionisation of Sodium 3s in the Vicinity of the Dipole Cooper Minimum Open

Nishita M. Hosea, Jobin Jose, Hari R. Varma, P. C. Deshmukh, Steven T. Manson · 2023

A procedure to obtain relativistic expressions for photoionisation angular distribution parameters using the helicity formulation is discussed for open-shell atoms. Electric dipole and quadrupole transition matrix elements were considered …

Solar Cells, Lambert W and the LogWright Functions Open

Prabhat Lankireddy, Sibibalan Jeevanandam, Aditya Chaudhary, P. C. Deshmukh, K. Roberts , et al. · 2023

Algorithms that calculate the current-voltage (I-V) characteristics of a solar cell play an important role in processes that aim to improve the efficiency of a solar cell. I-V characteristics can be obtained from different models used to r…

Great Inequality of Jupiter and Saturn I: The Planetary Three Body Problem, Heliocentric development by Lagrange multipliers, Perturbation Theory Formulation Open

Jonathan Tot, S. R. Valluri, P. C. Deshmukh · 2023

In this paper, we undertake to present a self-contained and thorough analysis of the gravitational three body problem, with anticipated application to the Great Inequality of Jupiter and Saturn. The analysis of the three body Lagrangian is…

Temporal Response of Atoms Trapped in an Optical Dipole Trap: A Primer on Quantum Computing Speed Open

S. Baral, Raghavan K. Easwaran, Jobin Jose, Aarthi Ganesan, P. C. Deshmukh · 2023

An atom confined in an optical dipole trap is a promising candidate for a qubit. Analyzing the temporal response of such trapped atoms enables us to estimate the speed at which quantum computers operate. The present work models an atom in …

Dramatic relativistic effects on the ns dipole angular distribution asymmetry parameter, βns , of heavy and superheavy elements Open

S. Baral, Subhasish Saha, Km Akanksha Dubey, Jobin Jose, P. C. Deshmukh , et al. · 2023

A theoretical study of the dipole photoelectron angular distribution asymmetry parameter, β , of the 6s, 5s and 4s subshells has been conducted for a range of closed-shell heavy, Hg ( Z = 80), Rn ( Z = 86), Ra ( Z = 88) and superheavy, No …

Preface for advances in atomic, molecular, and optical sciences (2020) Open

John Costello, P. C. Deshmukh, T. W. Gorczyca, A. S. Kheifets, A. Z. Msezane , et al. · 2022

Photoionization of Atomic Systems Using the Random-Phase Approximation Including Relativistic Interactions Open

P. C. Deshmukh, Steven T. Manson · 2022

Approximation methods are unavoidable in solving a many-electron problem. One of the most successful approximations is the random-phase approximation (RPA). Miron Amusia showed that it can be used successfully to describe atomic photoioniz…

Photoionization branching ratios of spin-orbit doublets far above thresholds: Interchannel and relativistic effects in the noble gases Open

C. Rasadi Munasinghe, P. C. Deshmukh, Steven T. Manson · 2022

Photoionization branching ratios of all of the spin-orbit doublets in the noble gas atoms Ne, Ar, Kr, and Xe have been investigated theoretically at energies well above the thresholds. The results confirm in all cases that the general beha…

Unusual behavior of Cooper minima of subshells in high- atoms Open

S. Baral, Subhasish Saha, Km Akanksha Dubey, Jobin Jose, P. C. Deshmukh , et al. · 2022

Here, a study of Cooper minima (CM) arising from the photoionization of 6$\\textit{s}$, 5$\\textit{s}$, and 4$\\textit{s}$ subshells of high-$\\textit{Z}$ atoms has been performed using Dirac-Fock (DF), two-channel relativistic-random-phas…

Eisenbud–Wigner–Smith time delay in atom–laser interactions Open

P. C. Deshmukh, Sourav Banerjee, Ankur Mandal, Steven T. Manson · 2021

Electronic structure and dynamics of confined atoms Open

P. C. Deshmukh, Jobin Jose, Hari R. Varma, Steven T. Manson · 2021

Nonstatistical behavior of the photoionization of spin–orbit doublets Open

R. Püttner, Jessica B. Martins, T. Marchenko, Oksana Travnikova, R. Guillemin , et al. · 2021

The photoionization branching ratios of spin–orbit doublets are studied both experimentally and theoretically at energies several keV above threshold. The results show significant relativistic effects for Ar 2 p in the autoionizing region …

Photoionization of Xe 5s: angular distribution and Wigner time delay in the vicinity of the second Cooper minimum Open

Aarthi Ganesan, Sourav Banerjee, P. C. Deshmukh, Steven T. Manson · 2020

The angular distribution and photoionization Wigner time delay of Xe 5s photoelectrons are studied in the region of the second Cooper minimum (SCM) using (i) the relativistic multiconfiguration Tamm–Dancoff approximation, (ii) the relativi…

Relativistic and correlation effects in the photoionization dynamics of oganesson : Spin-orbit-interaction-activated interchannel coupling effects Open

Jobin Jose, S. Baral, P. C. Deshmukh, Steven T. Manson · 2020

High-Z atoms are excellent laboratories to study the combination of relativistic and many-electron correlation effects in electronic structure and dynamics. In the present work, the relativistic-random-phase approximation at different leve…

Photoionization of superheavy atoms: correlation and relativistic effects Open

Ahmad Razavi, Rezvan Hosseini, David Keating, P. C. Deshmukh, Steven T. Manson · 2020

Calculations of the photoionization cross sections of the ground states of the superheavy atoms No (Z = 102), Cn (Z = 112) and Og (Z = 118) have been performed using fully relativistic methodologies. The photoionization cross sections are …

Lambert W function methods in double square well and waveguide problems Open

Narola Harsh Bharatbhai, P. C. Deshmukh, Robert B. Scott, K. Roberts, S. R. Valluri · 2020

Using methods related to the Lambert W function, we present solutions of two apparently different problems: (1) The one-dimensional double square well potential in quantum mechanics and (2) The transverse electric and magnetic modes for a …

Effects of spin-orbit-interaction-activated interchannel coupling on photoemission time delay Open

Sourav Banerjee, P. C. Deshmukh, A. S. Kheifets, Steven T. Manson · 2020

Here, spin-orbit-interaction-activated interchannel coupling (SOIAIC) has been investigated theoretically in the time delay domain for 3d photoemission in the isoelectronic sequence I^–, Xe, and Cs⁺ using the relativis…

Effects of relativistic interactions in photodetachment time delay of Br− Open

Soumyajit Saha, Jobin Jose, P. C. Deshmukh, A. S. Kheifets, V. K. Dolmatov , et al. · 2020

Synopsis Wigner time delay in photodetachment of Br − has been studied. The absence of Coulomb phase in photodetachment process makes the Wigner time delay more sensitive to the centrifugal barrier shape resonance and threshold effects. Im…

Effect of SOIAIC on photoionization time delay of the Xe 3d subshell Open

Sourav Banerjee, P. C. Deshmukh, Steven T. Manson · 2020

Synopsis The effect of spin-orbit activated interchannel coupling (SOIAIC) has been studied on the time delay spectrum of 3d photoionization in xenon. The relativistic-random-phase-approximation with relaxation (RRPA-R) has been used to ca…

Photoionization of superheavy elements Open

Rezvan Khademhosseini, Ahmad Razavi, David Keating, P. C. Deshmukh, Steven T. Manson · 2020

Synopsis Calculations of the photoionization cross sections for the superheavy atoms of atomic numbers 102, 112 and 118 have been performed using the relativistic-random-phase approximation (RRPA) which is based on the Dirac equation. The …

Entropic uncertainty as a predictor of avoided crossing for confined system Open

Subhasish Saha, Jobin Jose, P. C. Deshmukh · 2020

Synopsis Avoided Crossings are one of the unique spectroscopic features of confined atomic system. Shannon’s information entropy as a predictor of these phenomena by varying the perturbation (confinement strength) on ground state and some …

An analytic study of the Wiedemann–Franz law and the thermoelectric figure of merit Open

Aakash Yadav, P. C. Deshmukh, K. Roberts, NM Jisrawi, SR Valluri · 2019

Advances in optimizing thermoelectric material efficiency have seen parallel activities in theoretical and computational studies. In the current work, we calculate the exact Fermi–Dirac integrals to enable the generalization of the Wiedema…

Dominance of correlation and relativistic effects on photodetachment time delay well above threshold Open

Soumyajit Saha, P. C. Deshmukh, A. S. Kheifets, Steven T. Manson · 2019

In this work, Wigner time delay in photodetachment from the 3p3/2 and 3p1/2 subshells of Cl- has been studied in the vicinity of the 2p3/2 and 2p1/2 thresholds, using the relativistic random phase approximation (RRPA). The results show tim…

Wigner time delay in photodetachment Open

Soumyajit Saha, Jobin Jose, P. C. Deshmukh, G. Aravind, V. K. Dolmatov , et al. · 2019

Using Cl^- as a test case,Wigner time delay in the photodetachment process has been investigated theoretically, along with the photoionization of the isoelectronic Ar atom, for the outer 3p shell using the relativistic-random-pha…

Strong dependence of photoionization time delay on energy and angle in the neighborhood of Fano resonances Open

Sourav Banerjee, P. C. Deshmukh, V. K. Dolmatov, Steven T. Manson, A. S. Kheifets · 2019

We uncover dramatic variations of the Wigner photoemission time delay with energy and angle in the vicinity of a Fano resonance with the time delay taking opposite signs at different angles at the same energy as well as at the opposite sid…

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