Identification of the EF1Σg+(v′ = 31 and 32) states of H2 by XUV-VIS double-resonance spectroscopy

Fluorescence lifetimes of the , , R1Πg, and states of H2

“…1. Term values for EF (v = 32, J = 1-5) have been reported by our group, where B (v = 7, J) were employed as intermediated levels [5]. The energies obtained in the present study agree with these previous values within 0.05 cm À1 .…”

“…Their assignments are, however, only partial due to the spectral complexity and irregularity originating from vibronic mixing among the upper gerade states. In 1992, employing two step laser excitation spectroscopy, we have succeeded in observing a number of levels belonging to the EF þ GK þ H 1 R þ g , I 1 P g , and J 1 D g states [4][5][6]. The most through theoretical study before our spectroscopic measurements had been published by Quadrelli et al [7], where nonadiabatic coupling among the EF þ GK þ H 1 R þ g , I 1 P g , and J 1 D g manifolds was computed.…”

Observation of the I′ 1Πg outer well state in H2 and D2

“…͑6͒ with a n ϭ 2ͱ nϪ2 2 ; the results discussed here are insensitive to an uncertainty of at least 0.2 cm Ϫ1 . We find that data points of both isotopes fit well to a straight line with a slope of Ϫ0.97, close to the expected slope of Ϫ1.…”

“…[1][2][3][4][5][6][7][8][9] These sophisticated techniques are presently employed to bridge the 11 eV gap between the ground state and the first excited singlet state in hydrogen and to drive transitions between excited states.…”

“…1,19 Tsukiyama and co-workers observed a number of singlet gerade levels close to the (nϭ2) limit using resonanceenhanced two-photon transitions, excited by XUV and visible pulsed lasers and detected by observation of their fluorescence in the visible and near infrared. 2,16,20 Lifetimes were deduced from the exponential decay of the fluorescence. Chandler and Thorne 21 employed a delayed laser pulse and REMPI detection to measure the decay times of some EF levels.…”