2004/07/23 by Roman Schmied, Pierre Carcabal, Pierre Çarçabal +4 · 1 citation
Physics and Astronomy · #Astrophysics and Star Formation Studies #Atomic and Subatomic Physics Research #Quantum, superfluid, helium dynamics #physics.atm-clus #physics.chem-ph
paper · pdf · doi:10.1063/1.1767515
published as Journal of Chemical Physics 121(6): 2701-2710 (2004) · 20 pages, 7 figures
arxiv created 2004/07/23 · openalex publication_date 2004/07/23 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We report spectra of various benzene isotopomers and their dimers in helium nanodroplets in the region of the first Herzberg-Teller allowed vibronic transition 6(0)(1) (1)B(2u)<--(1)A(1g) (the A(0) (0) transition) at approximately 260 nm. Excitation spectra have been recorded using both beam depletion detection and laser-induced fluorescence. Unlike for many larger aromatic molecules, the monomer spectra consist of a single "zero-phonon" line, blueshifted by approximately 30 cm(-1) from the gas phase position. Rotational band simulations show that the moments of inertia of C(6)H(6) in the nanodroplets are at least six-times larger than in the gas phase. The dimer spectra present the same vibronic fine structure (though modestly compressed) as previously observed in the gas phase. The fluorescence lifetime and quantum yield of the dimer are found to be equal to those of the monomer, implying substantial inhibition of excimer formation in the dimer in helium.