Absorption Spectra of H2 in the Vacuum Ultraviolet Region. II. The B′—X, B″—X, D—X, and D′—X Bands

Abstract

The absorption spectrum of the H2 molecule has been studied in the wavelength region 840 to 930 Å with a 6.8 m grazing incidence vacuum spectrograph in combination with the helium continuum. All the possible levels, which lie below the dissociation limit H(12Sg)+H(22Sg,22Pu), of the odd singlet states have been identified in the present investigation. There are strong heterogeneous perturbations between the B′ and the D states, weak heterogeneous perturbations between the B′ and D′ states and a medium strength homogeneous perturbation between the B′ and the B″ states. The perturbation parameters have been estimated in each case. In the present paper, the results of the rotational and vibrational analyses are given for the B′—X, B″—X, D—X, and D′—X bands. The experimental evidence found in the present study suggests that the predissociation in the levels with v≥3 of the D state is of the type b0, according to Mulliken's classification.

High-resolution laser spectroscopy on H2 at 97?98 nm

“…Because the data of Abgrall et al were recorded in emission, low J-value transitions to X 1 S / g , £ Å 0 are in many cases self-reversed. In contrast, the data of Namioka (3,5) -FIG. 2.…”

“…The uncertainties, given on an absolute frequency scale, include statistical as well as systematic effects. In the tables the currently obtained data are compared with existing data: absorption data of Namioka (3,5) and recent data of . Because the data of Abgrall et al were recorded in emission, low J-value transitions to X 1 S / g , £ Å 0 are in many cases self-reversed.…”

High Resolution Laser Spectroscopy of H2at 86–90 nm

“…The uncertainties, given on an absolute frequency scale, include statistical as well as systematic effects. In the tables the currently obtained data are compared with existing data: absorption data of Namioka (3,5) and recent data of Abgrall et al (8)(9)(10). Because the data of Abgrall et al were recorded in emission, low J-value transitions to X 1 S / g , £ Å 0 are in many cases self-reversed.…”

“…Based on combination differences in the C 1 P u , £ (4). The B 1 S / u and D 1 P u states, correlating with higher Å 9 state and supported by a proposal for an astrophysical lying atomic states, were studied in absorption also by Namipumping mechanism Sorokin and Glownia (14, 15) assigned oka (5). The C 1 P u and D 1 P u states were investigated in some of the DIB-features in the wavelength ranges 700-emission by Roncin et al (6).…”

On a possible variation of the proton-to-electron mass ratio: H2 spectra in the line of sight of high-redshift quasars and in the laboratory

“…Twenty years later, Werner reported the analysis of the C 1 P u À X 1 R þ g band system [56], now referred to as the Werner band system. In subsequent years, covering half a century, investigations on the H 2 spectrum of ever increasing resolution and accuracy were reported by Dieke and Hopfield [57], Hori [58], Hyman [59], Jeppesen [60], Dieke [61], Herzberg and Howe [62], Monfils [63], and Namioka [64,65], culminating in the benchmark study of Dabrowski [66]. In the upcoming sections, and in particular in the Tables, reference to the Lyman and Werner band systems is abbreviated, where Lv refers to B …”