Abstract
The two-photon absorption spectrum of NO2 in the energy region from 55 000 to 60 000 cm-1 shows two new highly resolved band systems. The lower of these is recognized as the 3pσ 2Σu+ Rydberg state, higher members of which have been observed in previous work by conventional vacuum-UV absorption spectroscopy. The higher system is assigned to its companion 3pπ 2IIu Rydberg state, seen here for the first time. Both band systems evidence clear origins in bent-to-linear transitions, assignments which are confirmed by the rotational structure of individual bands. An important feature of these spectra is the high intensity of the origin and low-frequency cold bands, which deviates strongly from Franck-Condon predictions. We suggest that this behavior can be explained by intramolecular relaxation within the continuum of intermediate states resonant with the first photon.
Original language | English (US) |
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Pages (from-to) | 1273-1275 |
Number of pages | 3 |
Journal | Journal of physical chemistry |
Volume | 88 |
Issue number | 7 |
DOIs | |
State | Published - 1984 |
Externally published | Yes |
ASJC Scopus subject areas
- General Engineering
- Physical and Theoretical Chemistry