Pressure shifts in high-precision hydrogen spectroscopy. I. Long-range atom–atom and atom–molecule interactions

UD Jentschura, CM Adhikari, R Dawes… - Journal of Physics B …, 2019 - iopscience.iop.org
We study the theoretical foundations for the pressure shifts in high-precision atomic beam
spectrosopy of hydrogen, with a particular emphasis on transitions involving higher excited …

Magic Wavelengths for 1SnS and 2SnS Transitions in Hydrogenlike Systems

CM Adhikari, JC Canales, TPW Arthanayaka… - Atoms, 2021 - mdpi.com
We study the magic wavelength for two-photon 1 S–n S transitions in a hydrogen and
deuterium atom, as well as 2 S–n S transitions, where the lower level is the metastable 2 S …

Long-Range Interactions for Hydrogen: 6P–1S and 6P–2S Systems

UD Jentschura, CM Adhikari - Atoms, 2017 - mdpi.com
The collisional shift of a transition constitutes an important systematic effect in high-precision
spectroscopy. Accurate values for van der Waals interaction coefficients are required in …

Dispersion in Single-Wall Carbon Nanotube Film: An Application of Bogoliubov–Valatin Transformation for Hamiltonian Diagonalization

CM Adhikari, DSM Morris, TW Noonan, T Neupane… - Condensed …, 2023 - mdpi.com
We present a theoretical study on the energy dispersion of an ultrathin film of periodically-
aligned single-walled carbon nanotubes (SWCNTs) with the help of the Bogoliubov–Valatin …

Long-Range Interactions for Hydrogen Atoms in Excited D States

CM Adhikari, UD Jentschura - Atoms, 2022 - mdpi.com
Pressure shifts inside an atomic beam are among the more theoretically challenging effects
in high-precision measurements of atomic transitions. A crucial element in their theoretical …

[BOOK][B] Long-range interatomic interactions: Oscillatory tails and hyperfine perturbations

CM Adhikari - 2017 - search.proquest.com
We study the long-range interaction between two hydrogen atoms, in both the van der Waals
and Casimir-Polder regimes. The retardation regime is reached when the finiteness of the …

Long-Range Interactions for Hydrogen: 6P-1S and 6P-2S

UD Jentschura, CM Adhikari - arxiv preprint arxiv:1711.10036, 2017 - arxiv.org
The collisional shift of a transition constitutes an important systematic effect in high-precision
spectroscopy. Accurate values for van der Waalsinteraction coefficients are required in order …