Xe2 and Kr2 gerade state symmetries by polarization measurements

Dissociation dynamics of the low-lying Rydberg states of Xe2: a velocity map imaging study

“…The xenon dimer (Xe 2 ) has been the subject of numerous experimental and theoretical [22][23][24][25][26][27][28][29][30][31] studies owing to its applicability as a gain medium for vacuum ultraviolet (VUV) lasing and as a possible kinetic intermediate in atomic Xe infrared lasers. 14,[32][33][34] Experimental techniques applied to study Xe 2 have included absorption spectroscopy, 1,2,11,35 resonance enhanced multi-photon ionization (REMPI), [3][4][5][6]14,[18][19][20] photoelectron spectroscopy, 7,10,15,16 laser induced fluorescence (LIF), 9,13,17,21 and, recently, velocity map imaging (VMI). 8,36,37 For the most part, these experimental studies have focused on the spectroscopic characterization of Rydberg states which correlate with Xe 5p 6 ( 1 S 0 ) + Xe* products, where Xe* represents excited state xenon in 5p 5 6s, 5p 5 6p, 5p 5 5d, or 5p 5 7s electronic configurations.…”

“…14,[32][33][34] Experimental techniques applied to study Xe 2 have included absorption spectroscopy, 1,2,11,35 resonance enhanced multi-photon ionization (REMPI), [3][4][5][6]14,[18][19][20] photoelectron spectroscopy, 7,10,15,16 laser induced fluorescence (LIF), 9,13,17,21 and, recently, velocity map imaging (VMI). 8,36,37 For the most part, these experimental studies have focused on the spectroscopic characterization of Rydberg states which correlate with Xe 5p 6 ( 1 S 0 ) + Xe* products, where Xe* represents excited state xenon in 5p 5 6s, 5p 5 6p, 5p 5 5d, or 5p 5 7s electronic configurations. Numerous curve crossings in this spectral region lead to perturbations in the observed band systems with several states suffering predissociation.…”

“…8,10,13,36,37 Spectroscopic investigations particularly pertinent to this study have been reported by Dehmer et al, 3,10 by Gornik et al, 9,21 and Lipson and coworkers. [4][5][6][7]14,15,19 These investigations involved two-photon excitation of Xe 2 Rydberg states observed via photoionization [3][4][5][6][7]10,14,16,19 or fluorescence. 9,21 Two-photon transitions in Xe 2 occur between the X0 electronic ground state and the gerade excited states.…”

“…Of the eleven potentially accessible molecular states formed from Xe 5p 6 ( 1 S 0 ) + Xe* 5p 5 6p electronic configurations, six have been characterized spectroscopically with a seventh tentatively assigned as correlating with Xe 5p 6 ( 1 S 0 ) + Xe* 5p 5 6p 2 [ 5 / 2 ] 2 products. 4 Twophoton transitions to these electronic states span the spectral region from 76900 cm -1 to 80100…”

“…cm -1 . Figure 1 summarises the potential energy curves of the 0 , 1 , and 2 Xe 2 excited states observed in the vicinity of the atomic Xe* 5p 5 6p ← Xe 5p 6 ( 1 S 0 ) transitions.…”