ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
Using the technique of Fourier transform microwave spectroscopy in the range 1–14 GHz Q-branch rotational transitions have been observed for 121SbH3 and 123SbH3 in the ground, v2=1 and v4=1 vibrational states with an accuracy of 0.1–100 kHz. A1–A2 splitting transitions for k=±3 in the ground state, k=±3, ±9 in v2=1, and for kl=+1, −2, +4 in the v4=1 vibrational state have been observed. We also measured perturbation-allowed transitions with selection rule Δk=±3 in the ground vibrational state for k=±1↔(minus-plus)2, with selection rules Δ(k–l)=3,6,9 in the v2=1 state for k=±1↔(minus-plus)2, 0↔±3, ±2↔(minus-plus)4, ±2↔(minus-plus)7, and 0↔±9 and in the v4=1 state for kl=+2↔+3, +2↔+6, and +3↔+5. The transitions show hyperfine structures due to the quadrupole and spin-rotation coupling of the nuclear spin ISb and the rotational angular momentum J. Hyperfine structures in the dyad v2=1, v4=1 have been analyzed using an effective Hamiltonian extended to higher order spin-rotation coupling terms and including spin-vibration coupling. A total of 21 hyperfine parameters has been determined for each isotopomer including quadrupole and spin-rotation constants of the (Δl,Δk)=(0,3), (2,2), and (2,−1) interactions. A similar analysis has been performed for the ground vibrational state yielding 7 (6) hyperfine parameters for 121SbH3 (123SbH3) including the (0,3) interaction constants. Splittings of transitions between E-states involving basis states with k=±1 have been observed in the ground, v2=1 and v4=1 vibrational states. This splitting has been unequivocally explained as lifting of parity degeneracy by proton hyperfine interactions. From the analysis of the ground state hyperfine doublets, tensorial constants of the H spin-rotation coupling and the Sb–H spin–spin interaction have been accurately determined. © 2001 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1342013
