A study of spin and symmetry forbidden transitions in CS 2 by high resolution energy-loss spectroscopy

Resonance enhanced multiphoton ionization spectroscopy of carbon disulphide

“…5͑a͔͒ was obtained following excitation at 483.1 nm ͑3ṽϭ62 100 cm Ϫ1 ͒; the kinetic energy of the major peak ͑0.188 eV͒ is consistent with ionization to the v ϩ ϭ0 ͑shorthand notation for v 1 ϩ ϭv 2 ϩ ϭv 3 ϩ ϭ0͒ level of the lower, ͓3/2͔, spin-orbit component of the ion thus implying, by Franck-Condon arguments, that the resonance enhancement also involves an electronic origin, almost certainly that of a Rydberg state built on the ͓3/2͔ ion core. Such a conclusion is fully consistent with that reached in a number of previous analyses; 8,10,13,39 namely, that this feature should be assigned as the origin of the resonance. The associated REMPI-PE spectra shown in Figs.…”

“…Both the spectroscopy [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] and the photochemistry 9,[17][18][19][20][21][22][23][24][25][26][27][28][29][30] of excited electronic states of the carbon disulphide molecule, CS 2 , have been the subject of extensive study over the past half century. Like carbon dioxide, CS 2 has a linear ͑D ϱh symmetry͒ ground state geometry, with 16 valence electrons arranged in the configuration…”

“…Price and Simpson 1 were the first to identify two Rydberg series in the vuv region, converging to the two spin-orbit components of the ground state ion. The energy range up to and including the first ionization limit has been much studied subsequently, both in one photon absorption 1,5,8,13,14 and by electron impact spectroscopy, 10,11 but multiphoton studies of the excited states of CS 2 , have, until very recently, remained sparse. Yet, as we are reminded in Table I, it is for centrosymmetric systems like CS 2 that multiphoton studies should, potentially at least, be most valuable.…”

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).…”

“…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][46], photoelectron or photoionization studies [47][48]…”