Terahertz Measurements of Rotational Transitions in Vibrationally Excited States of N2O

Extended THz measurements of nitrous oxide, N2O

“…In SPFIT, the q term is simply an expectation value of AEljq/ 2jl ± 2ae without explicit vibrational dependence as in [3]. This results in a ffiffi ffi n p factor in the definition of the parameter fitted using SPFIT when compared to [3], where n is the number of quanta in the bending mode. The q parameters presented in Table 4 reflect this difference.…”

“…Tables 3 and 4 show the derived Hamiltonian parameters for the different isotopically substituted species and vibrational states, respectively. The analyses for the isotopically substituted species as well as the ðm 1 m l 2 m 3 Þ ¼ ð00 0 0Þ and (01 1 0) states are identical to that of [3,4], whereas the (020) analysis is similar to their effective Hamiltonian. It should be emphasized that the necessary inter-state parameters for the 2m 2 states depend on the energy difference of these states that accounts for overlap of the wavefunctions.…”

“…New data up to J = 68 will improve needs for future atmospheric sensing as well as enhance future infrared frequency calibrations. In addition to the data collected in the present work, other recent submm/THz measurements [3,4] have been incorporated into the present analysis. The JPL spectral line catalog [5], which previously included only the data available prior to 1996 [6][7][8][9][10][11][12][13], has been updated with the new information.…”

“…It should be emphasized that the necessary inter-state parameters for the 2m 2 states depend on the energy difference of these states that accounts for overlap of the wavefunctions. Since there is no infrared data in the present analysis, the vibrational energy, or term values, for the (02 0 0) and (02 2 0) levels were fixed to the values determined in [3] (G c from their parameter set I) from the combined vibrational and rotational band analysis. In SPFIT, the q term is simply an expectation value of AEljq/ 2jl ± 2ae without explicit vibrational dependence as in [3].…”

“…Since there is no infrared data in the present analysis, the vibrational energy, or term values, for the (02 0 0) and (02 2 0) levels were fixed to the values determined in [3] (G c from their parameter set I) from the combined vibrational and rotational band analysis. In SPFIT, the q term is simply an expectation value of AEljq/ 2jl ± 2ae without explicit vibrational dependence as in [3]. This results in a ffiffi ffi n p factor in the definition of the parameter fitted using SPFIT when compared to [3], where n is the number of quanta in the bending mode.…”