Far-infrared amplified spontaneous emission and collisional energy transfer between the e 0g+ (3 P 2) and D 0u+ (3 P 2) ion-pair states of I2

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Abstract

We report direct observation of far-infrared amplified spontaneous emission from the E0g+ (3P2) (vE = 0 - 3) ion-pair state of I2 by using an optical-optical double resonance technique with the B 3Πu (0u +) (vB = 19) valence state as the intermediate state. The directional far-infrared emission detected in the wavelength range from 19 to 28 μm was assigned to the vibronic transitions from the E0g + (3P2) ion-pair state to the D0 u+ (3P2) ion-pair state. The subsequent UV fluorescence from the D0u+ ( 3P2) state was also observed, which consists not only from the vibrational levels populated by the amplified spontaneous emission but also from those populated by collisional energy transfer. Analyses of the vibrational distribution in the D0u+ (3P 2) state revealed that the population transfer through the amplified spontaneous emission was dominant under our experimental conditions.

Original languageEnglish
Article number104309
JournalJournal of Chemical Physics
Volume140
Issue number10
DOIs
Publication statusPublished - 14 Mar 2014

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