Infrared photodissociation spectra of the C-H stretch vibrations of C6H6+-Ar, C6H6+-N2, and C6H6+-(CH4)1-4
Abstract
Vibrational infrared photodissociation spectra of mass selected C6H6+-Ar, C6H6+-N2, and C6H6+-(CH4)1-4 ionic complexes are recorded in the spectral range of the C-H stretching vibrations. Transitions at 3095±15 cm-1 occur in all spectra and are assigned to C-H stretch fundamentals of the benzene cation in its 2E1g electronic ground state. In the case of the C6H6+-(CH4)1-4 complexes, additional transitions at 2904±7 and 3010±24 cm-1 are observed and attributed to the symmetric and antisymmetric C-H stretch vibrations of the CH4 ligands, ν1 and ν3. The deduced C-H stretching vibrations of C6H6+ in the 2E1g ground state are roughly 30 cm-1 higher than the corresponding frequencies in the 1A1g electronic ground state of the neutral species, indicating that the C-H bonds become stronger upon removal of an electron from the highest occupied e1g orbital of C6H6.
- Publication:
-
Journal of Chemical Physics
- Pub Date:
- December 1999
- DOI:
- 10.1063/1.480492
- Bibcode:
- 1999JChPh.11110754D
- Keywords:
-
- 33.80.Gj;
- 82.50.Fv;
- 33.20.Ea;
- 33.20.Tp;
- 33.15.Mt;
- 36.40.Qv;
- 36.40.Mr;
- Diffuse spectra;
- predissociation photodissociation;
- Infrared spectra;
- Vibrational analysis;
- Rotation vibration and vibration-rotation constants;
- Stability and fragmentation of clusters;
- Spectroscopy and geometrical structure of clusters