ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
The two-photon resonant, three-photon (2+1) ionization spectra of jet-cooled mXenXe, at energies near the Xe* 5d[5/2]03 state, are reported. A new progression has been observed and is attributed to transitions from the van der Waals ground state, X 1Σ+g(0+g), through bound vibrational levels of an excited state of gerade symmetry. The analysis of some 26 closely spaced vibronic bands and isotope effects provides information on the excited and ground state potential energy curves. The vibrational quantum number of the lowest frequency band near 82 539.1 cm−1 is assigned to v'=6±1. For v'=6 this leads to molecular constants Te' (approximately-equal-to) 82 514.9 cm−1, ωe' (approximately-equal-to) 5.7955 cm−1, and ωexe' (approximately-equal-to) 0.07491 cm−1. The upper state can be described by a Morse potential with dissociation energy De' (approximately-equal-to) 112.10 ± 0.05 cm−1 and internuclear separation Re' (approximately-equal-to) 5.51 ± 0.03 A(ring). This is consistent with assignment to a Rydberg molecular state of either the B 2Π1/2g or D 2Σ+1/2g ion core. At the Xe 1S0+Xe* 5d[5/2]03 threshold the molecular spectrum terminates and continuum absorption is evidenced by a rise and fall in the fragment ion yield. The direct determination of the dissociation limit for the excited state is used to derive the ground state dissociation energy De‘(approximately-equal-to) 196.32 ± 0.05 cm−1.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.467077
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