Adya P. Mishra

Rovibrational matrix elements of multipole moments of the HD, HT and DT molecules

Rovibrational matrix elements of the multipole moments Q ℓ of HD, HT and DT for ranks 2 ≤ ℓ ≤ 11 have been computed. Since the present calculations have been performed with the nuclear centre of mass (rather than the geometric centre) as the origin, the computations had to include even as well as odd values of ℓ. The results are used to correlate the absorption intensities of the zero-phonon single transitions in solid HD to theory.

RESEARCH NOTE Rovibrational matrix elements of multipole moments of the D2 and T2 molecules

Rovibrational matrix elements of the multipole moments Ql of D2 and T2 up to rank 10 have been computed. The results are used to correlate the absorption intensities of the zero-phonon transitions in solid D2 to theory.

Multipole moments and polarizabilities of nonpolar diatomic molecules through quantum solvation in solid parahydrogen: The quadrupole moment of N2

It is shown in this paper that from the study of the induced infrared absorption spectra of homonuclear diatomic molecules solvated as impurities in a molecular quantum solid, it is possible to extract information about the rovibrational matrix elements of the multipole moments and polarizability of the embedded molecule. Theoretical expressions are derived for the integrated absorption coefficients of various multipole-field-induced double transitions involving guest-host pairs in a solid para-H(2) matrix. The intensities of some of the quadrupole moment induced transitions involving the N(2)-para-H(2) pair have been measured. From a comparison of the experimental and theoretical intensities, rovibrational matrix elements of the quadrupole moment of N(2) are determined in its ground vibrational state.

Fourier-transform spectroscopic study of the rotational intensity distribution in the first positive B3Πg–A3Σu+ band system of the nitrogen molecule

Abstract In the present work we have studied the rotational intensity distribution in the 0–0, 0–1 and 1–3 bands of the B3Πg–A3Σu+ system of N2 recorded on a Fourier transform spectrometer. The effective Hamiltonian used by Roux et al. (J. Mol. Spectrosc. 97 (1983) 253) for reduction of the experimental line position data to molecular parameters, is found to be adequate in reproducing the observed line intensities. To enhance the accuracy of the theoretical line intensity calculations, it proved necessary to use rotation-dependent Frank–Condon factor. Using the calculated intensities, it was possible to identify certain rotational lines belonging to the weakest branches Q13 and Q31, not reported before.

Lifetimes and excitation-functions of levels in ArII-ArIV

Abstract Beam—foil spectra of Ar ions in the u.v.—visible region were investigated at incident beam energies in the range of 170–340 keV. These studies have resulted in correcting several discrepancies in earlier data on energy levels. Excitation function results are seen to follow the charge state distributions except in a few cases. Lifetimes of several levels have been measured for the first time.

The crystal-field splitting of rovibrational Wv(0), Yv(0), and [ΔJ=10]v(0) transitions of solid parahydrogen

The present work is concerned with the theoretical study of the crystal-field splitting of rovibrational W(v)(0), Y(v)(0), and [DeltaJ = 10](v)(0) transitions of solid parahydrogen, by considering three lowest terms in the anisotropic crystal-field interaction potential. The theoretical expressions are derived for the matrix elements of Racah spherical harmonics: C(2,0)(Omega), C(4,0)(Omega), and C(6,0)(Omega). It is observed that the magnitude of the third-order crystal-field parameter epsilon(6c) is comparable with that of the lowest-order parameter epsilon(2c). Further the theoretical values of epsilon(2c) reported previously are too low. Contrary to the earlier results, the calculated value of epsilon(2c) in the present work is seen to be in good agreement with that obtained by fitting experimental data to the Hamiltonian containing three lowest anisotropic interaction terms.

Generalized distribution of negative binomial states

We present analytical expression for the s-parametrized quasiprobability distribution W((alpha) , (epsilon) , s) for the negative binomial states. As special cases, for s equals -1, 0, and 1, W((alpha) , (epsilon) , s) reduces to the Q-distribution, the Wigner distribution, and the Glauber-Sudarshan P-function, respectively.