| Autor: |
Scheele, Iris, Conjusteau, André, Callegari, Carlo, Schmied, Roman, Lehmann, Kevin K., Scoles, Giacinto |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; 3/8/2005, Vol. 122 Issue 10, p104307, 4p, 3 Graphs |
| Abstrakt: |
The ν5+ν9 spectra of ethylene, C2H4, and its dimer, solvated in helium nanodroplets, have been recorded in the wavelength region near 1.6 μm. The monomer transitions show homogeneous broadening of ≈0.5 cm-1, which is interpreted as due to an upper state vibrational relaxation lifetime of ≈10 ps. Nearly resonant vibrational energy transfer (ν5+ν9→2ν5) is proposed as the relaxation pathway. The dimer gives a single unresolved absorption feature located 4 cm-1 to the red of the monomer band origin. The scaling of moments of inertia upon solvation in helium is 1.18 for the monomer and >2.5 for the dimer. In terms of the adiabatic following approximation, this classifies the monomer as a fast rotor and the dimer as a slow rotor. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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