Berlin 2001 – wissenschaftliches Programm
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MO: Molekülphysik
MO 15: Post-Deadline Contributions Molecular Physics
MO 15.2: Poster
Freitag, 6. April 2001, 12:30–15:00, AT3
Laser induced emission and dissociation of carbon molecules in solid neon — •Aik Loong Ong, Tomonari Wakabayashi, and Wolfgang Krätschmer — Max-Plank-Institut für Kernphysik, Postfach 103980, D-69029
Various carbon clusters are produced by resistive heating of a graphite rod and trapped with excess of neon gas on a metal-coated sapphire substrate at 7 K to form a neon matrix. For the measurement of induced emission, an ultraviolet (UV) laser is tuned to the wavelength of an electronic transition of the C2 molecule (D1∑u +) at 232 nm and focused on the matrix. The UV transition of D1∑u +-B′1∑g + of C2 has been recorded for the first time in a neon matrix using an opticalmultichannel array spectrometer (OMA). In the dissociation experiment, the matrix sample was irradiated with the same UV laser at the wavelength of an UV absorption of linear C6 (235 nm) for about 4 hours. The infrared (IR) and UV absorption spectra are recorded before and after the irradiation. We found that the intensity of the IR absorption line of a linear C6 at 1958.7 cm−1 decreases after the irradiation. At the same time the UV band also diminishes. The intensity decrease of both IR and UV band is correlated, which indicates the decomposition of linear C6.