Action spectra vs rovibrational absorption spectra: A tool for photodissociation dynamics investigation

R. P. Schmid, Y. Ganot, S. Rosenwaks, I. Bar

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


Rovibrational excitation enables molecules to reach regions of the ground potential energy surface that are unavailable to vibrationless ground state species. Consequently, the photodissociation outcome may be affected via the Franck-Condon factor, which effectively influences the electronic excitation, depending on the initially prepared rovibrational state. Here we focus on the rovibrationally mediated photodissociation of C2HD/C2H2 and compare action spectra to rovibrational absorption spectra to study the photodissociation dynamics. Rovibrationally excited C2HD (in the 15637- 15735 and 1525615337 cm-1 regions) and C2H2 (in the 15480-15723 cm-1 region) are promoted to the excited electronic trans-bent states A1A(μ)/B1B(μ) and photodissociated by ~ 243.1 nm photons that also interrogate the H/D fragments. The yield of both H and D photofragments is greatly enhanced upon rovibrational excitation of both isotopomers showing both vibrational and rotational state dependencies. The mechanism for photoproduct propensity in C2HD and for intensity enhancement and photodissociation pathways in C2H2 is discussed.

Original languageEnglish
Pages (from-to)197-205
Number of pages9
JournalJournal of Molecular Structure
StatePublished - 4 May 1999


  • Action spectra
  • Rovibrational absorption spectra
  • Rovibrationally mediated photodissociation

ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy
  • Organic Chemistry
  • Inorganic Chemistry


Dive into the research topics of 'Action spectra vs rovibrational absorption spectra: A tool for photodissociation dynamics investigation'. Together they form a unique fingerprint.

Cite this