High resolution absorption spectrum of jet-cooled OCS between 64 000 and 91 000 cm−1

Abstract

Ab initio calculation of ( 2 + 1 ) resonance enhanced multiphoton ionization spectra and lifetimes of the ( D , 3 ) Σ − 2 states of OH and OD

Electronic excitation of carbonyl sulphide (COS) by high-resolution vacuum ultraviolet photoabsorption and electron-impact spectroscopy in the energy region from 4 to 11 eV

“…Ionisation energies (IEs) and vibrational assignments of the lowest-lying ionic states of COS were obtained by high resolution He(I) UV photoelectron spectra of COS + by Wang et al 13 including spin-orbit split components in theX 2 Π band. Cossart-Magos 14 reported the absorption spectrum of jet-cooled COS between 64 000 and 91 000 cm −1 (7.936-11.284 eV). Finally, a comprehensive and comparative study of elastic electron scattering from COS and CS 2 in the energy region from 1.2 to 200 eV has been reported by Murai et al 15 Electronic excitation was investigated by electron impact at 30 and 55 eV by Flicker et al, 16 and thereafter, more extensive studies were performed at 10 and 60 eV electron impact energies and 5-17 eV energy losses with high resolution of 25 meV by Leclerc et al 17 These electron collision studies were focused only on COS spectroscopy, and no reference is made to absolute cross section values.…”

Electronic states of carbon disulphide in the 5.5–11.8 eV region by VUV photo absorption spectroscopy

“…Table 1). There has been a lot of discussion regarding its assignment in literature as 4p 3 ∑ À g [23], 1 ∑ À u or 1 Π u [30], (4sσ) 1 Π g [1,5,11,[31][32][33]37] and recently 2Π u 3 3Π u 1 ∑ À g = 1 D g [44]. From our theoretical calculation, the 3,1 Π g states are predicted at 6.465 and 6.722 eV arising from 2π g -7σ g (4sσ g ) excitations having Rydberg character (Λ¼ 0.417).…”

“…Also tabulated are the amplitudes of the main orbital excitations (|c| 40.3), oscillator strengths (f) for singlet transitions and lambda diagnostic (Λ) values, which depict the nature of the excited states as Rydberg, valence or mixed character [64]. To the best of our knowledge the only theoretical computation on higher excited electronic states of CS 2 has been carried out by CM using the frozen core approximation [44][45][46]. Hereafter in the text theoretical computation refers to Table 3.…”

“…Excited state calculations are mainly restricted to the first five electronic states arising from 2π-3π excitation, their ordering for linear geometry (D 1h ) and bent (C 2v ) geometry (as the molecule deviates from linearity on excitation), where the degeneracies of the Λa0 electronic states are lifted. The most extensive work covering the valence and Rydberg states in the 5.5 to the first IP at 10.133 eV has been studied by two groups, viz., the S Couris group [37][38][39][40][41][42] using REMPI and high resolution absorption jet cooled spectroscopy by the Cossart-Magos group (hence referred to as CM) [44][45][46]. CM also reported detailed theoretical calculations for the excited states using frozen core calculations and assigned the observed spectrum to various valence and Rydberg series by comparing the results of the VUV absorption and various multiphoton ionization spectra [34][35][36][37][38][39][40][41][42][43].…”

“…In this work we revisit the vacuum ultraviolet (VUV) photoabsorption study of the electronic states of CS 2 carried out using the photo physics beamline on the 450 MeV Indus-1 synchrotron source in the 5.5-11.8 eV region [58]. The spectrum in this region comprises of richly structured valence and Rydberg transitions up to the first ionization potential (IP) at 10.1 eV (X 2 Π g ), the ground state of the molecular ion [44]. CS 2 has been studied in the past few years by diverse experimental techniques, including optical spectroscopy [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][19][20][21][22][23][24][25][26][27], in solid argon matrix [16], fluorescence [17,18], electron energy loss spectroscopy (EELS) [29][30][31][32], jet cooled resonance enhanced multiphoton ionization (REMPI) techniques [34][35][36][37][38][39][40][41][42][43][44][45]…”