Double resonance spectroscopy of theB″B¯Σu+1

Abstract

Double resonance spectroscopy via the EF 1 ⌺ g + , EF Ј =6,JЈ state has been used to probe the rovibrational structure of the ungerade double-well BЉB 1 ⌺ u + state of H 2 . Transitions to the BЉB 1 ⌺ u + , B = 17− 35, J =0−4 levels of the outer-well and to the B Љ B = 46− 50, J =0−4 levels of the combined inner and outer wells above the barrier have been recorded by detecting both molecular and atomic ion production as a function of energy by using a time of flight mass spectrometer. Theoretical energy calculations incorporating the most recent potential curves have been used to aid in the assignment of observed transitions. Over 70 new rovibrational term energies are reported. Where comparisons are possible, good agreement is observed between the experimental measurements reported here and those of previous measurements. While significant perturbations are observed in the energy region above the double-well barrier, assignments to states with dominant inner and outer-well characteristics can still be made. Distinct dynamical behaviors of the levels below, at, and above the barrier have also been observed.

Continuity of heavy Rydberg behaviour in the ungerade ion-pair states of H 2

“…These theoretical predictions agree with experiment, where available [19,20], to within $ 0:1 cm À1 . Fig.…”

1Σu and 1Πu states of the hydrogen molecule: Nonadiabatic couplings and vibrational levels

“…b The B 00 B, v = 37 level is missing in Ref. [17]. c The experimental level is probably misassigned.…”

“…[17] who determined experimentally many B 00 B state levels. We compare their results with our computations in Tables 15-17.…”

Spectroscopic observation of bound ungerade ion-pair states in molecular hydrogen

“…The unusual structure and dynamics of these molecular configurations have long been of interest; however, these same attributes have also made them difficult to study [8][9][10][11]. In particular, the ion-pair configuration has yet to be fully explored in molecular hydrogen.…”

“…Resonances are observed by ionizing neutral H(3l) to produce H + , which is then detected by using a time-of-flight mass spectrometer. Figure 2 illustrates the apparatus used to acquire ionization spectra [10]. Narrowbandwidth radiation at 193 nm is generated by frequency mixing the output of a 704-nm pulsed dye laser with the output of the fourth harmonic of a Nd:YAG laser at 266 nm and used to populate the v = 6 level of the E,F 1 + g state by two-photon absorption from the ground state.…”