Spectroscopy and dynamics of 9,10-dichloroanthracene-Arn van der Waals complexes

Aviv Amirav*, Mark Sonnenschein, Joshua Jortner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


In this paper we report on the measurements of the absorption spectra of large van der Waals complexes in planar supersonic jets. The absorption spectra and the fluorescence excitation spectra of the complexes of 9,10-dichloroanthracene (DCA) with Ar atoms are reported for the S0 → S1(0) vibrationless transition of DCA·Arn (n = 1-6), and from the S0 → S1 (1390 cm-1) transition of DCA·Arn (n = 1-4). Information on the structure of these complexes was inferred from the additivity of the spectral shifts per added rare-gas atom (ASSRA) for DCA·ARn (n = 1.2) and from deviations from the ASSRA for CDA-Arn (n = 3-6). The vibrational predissociation (VP) dynamics of DCA-Arn (n = 1-3) complexes was interrogated by fluorescence quantum yield, Y, measurements. The value of the S1 (1390 cm-1) state of DCA·Arn (n = 1-3) exhibits a dramatic enhancement relative to that of DCA. Utilizing the dependence of Y on the excess vibrational energy of bare DCA, we were able to estimate the internal energy of the fragments resulting from VP of DCA·Arn of DCA·Arn (n = 1-3). An upper limit of {reversed tilde equals} 100 ps was estimated for the VP (and/or vibrational energy redistribution) lifetime from the S1 (1390 cm-1) state of DCA·Ar3.

Original languageEnglish
Pages (from-to)199-207
Number of pages9
JournalChemical Physics
Issue number2
StatePublished - 1 Aug 1984


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