Far-Infrared Rotational Spectra of ZnH and ZnD in theX2Σ+(v= 0) State

Prospects for a polar-molecular-ion optical probe of varying proton-electron mass ratio

“…We instead estimate the value based on measurements made for molecules possessing a heavy atom both one row below and above tellurium in the periodic table. For ZnH, c I (H) was measured to be 60 kHz [68], and for AuH it was not observed within the experimental uncertainty of 30 kHz [67]. A measurement with similar uncertainty was made for AsH, where the value of c I (H) was determined to be smaller than the uncertainty as well [56].…”

Multi-isotopologue analyses of new vibration–rotation and pure rotation spectra of ZnH and CdH

“…We included all the diode laser infrared lines in our data set, and there was no systematic discrepancy between those lines and our calibrated line positions. The available pure rotation data [46][47][48] were also included in our data set as hyperfine-free line positions calculated in the same manner as mentioned above.…”

“…In addition, we have recorded new far-infrared spectra of CdH and CdD, and observed several rotational transitions in the v = 1 level of the X 2 R + state. We have combined our new data with those obtained from the previous vibration-rotation and pure rotation spectra [44][45][46][47][48], and performed multi-isotopologue fits for ZnH and CdH using a Dunham-type energy level expression [49] that was modified for 2 R + states. The isotopic dependence of the spin-rotation interaction constant (c), derived by Brown and Watson [50], was implemented in our fitting program, and we also included a simple vibrational dependence for this constant.…”

“…However, the number of rotational lines observed in each band was limited by the spectral ranges of the diodes available. Millimeter-wave and far-infrared spectra of ZnH and ZnD were obtained by Goto et al [46] and Tezcan et al [47], respectively, and several rotational lines in the v = 0 level of the X 2 R + ground state were measured. Recently, Varberg and Roberts [48] recorded the far-infrared spectra of CdH and CdD, and observed rotational transitions in the v = 0 level of the X 2 R + ground state.…”

Dunham Treatment Including Effects of the Born–Oppenheimer Breakdown for Open-Shell Diatomic Molecules in2Σ States

“…Since we are assuming the normal 1/ mass dependence for the spin-rotation interaction in the Hamiltonian [1], the corrections ⌬ ijk ␥ come from the nonadiabatic rotational and vibrational and adiabatic effects. Tezcan et al (45) measured very accurate far-infrared spectra of ZnH and ZnD and referred to a prospective test of a result by Brown and Watson (24) that the spin-rotation coupling constant ␥ e is proportional to (45). For such a test of the mass dependence of the spin-rotation coupling, it is necessary to separate the adiabatic and nonadiabatic contributions from the phenomenological values, ⌬ ijk ␥ .…”