Near-threshold photoionization of xenon metastable atoms*

Experimental and theoretical cross sections for photoionization of metastable Xe*. (6s 3 P 2, 3 P 0) atoms near threshold

“…in ionization potential and chemical interactions. The open shell nature of the Rg + [(m − 1)p 5 ] ion core leads, however, to specific properties of the rare gases such as series of prominent autoionization resonances between the two lowest ionization potentials 2 P 3/2 − 2 P 1/2 [1][2][3][4][5] and the presence of substantial admixture of d-valence character [6][7][8][9][10][11][12][13], which is especially strong for the Xe * (5p 5 6s J = 0) metastable level due to the proximity to the Xe * (5p 5 5dJ = 0) level [9][10][11][12][13]. The latter effects and the influence of electron correlations associated with virtual excitations of the core electrons [14][15][16][17][18][19] lead to the one photon excitation of nf Rydberg states besides np states and, On leave from: Rostov State University of Transport Communications, Rostov-on-Don, Russia correspondingly, cause the appearance of εf partial photoelectron waves besides εp waves in electric dipole single photoionization of Rg * , as described by the reactions:…”

“…It is expected that for the heavier rare gas atoms Ar * , Kr * , Xe * the influence of many-electron effects on the reactions (1)-(4) will be even stronger than for the Ne * atom. In particular, the investigation of the process (3) [9][10][11][12][13] has shown an extremely large influence of the 6s-nd mixing in the initial state of the Xe * (J = 0) atom on the photoionization process. In the calculations, reported in [13] for comparison with the measured absolute cross sections [13], a restricted set of additional 5p 5 nd configurations was used, resulting in theoretical cross sections which exceeded the experimental values by about a factor of two.…”

Laser photoionization of metastable Xe* (J=0) atoms in the range 462–430 nm

“…4a) corresponds to a fit involving the superposition of two Fano profiles according to (9) for the two 7p' resonances. The fitted widths, resonance positions Er and lineshape parameters q are listed in Table 1 and compared with the previous results [13,[15][16][17].…”

“…k Inserting (11) into (13) and comparing the result with (9) yields the following expressions for a. and aoo~t:…”

“…Recent experimental work includes the crossed thermal beam-pulsed dye laser study of Rundel et al (dye laser width 4 cm-~) [13], the optogalvanic spectroscopy investigation of Grandin and Husson (cw dye laser width 2 cm-1 [15], the crossed fast Xe* beam -pulsed dye laser study of King and Latimer (laser width 0.6 cm -1) [17] and the crossed thermal Xe* beam -pulsed dye laser investigation of Knight and Wang (laser width 0.3 cm-1) [16] [17]. Knight and Wang [16] suggested that the fast beam results are influenced by unrecognized systematic errors.…”