Naslov
Local laser superheating by quenching determined by DFWM and absorption thermometry

Autori
Motzkus, M. ; Pichler, Goran ; Kompa, K.L. ; Hering, P.

Izvornik
Chemical physics letters (0009-2614) 257 (1996), 1-2; 181-189

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
laser superheating ; quenching ; DFWM ; absorption thermometry

Sažetak
We used degenerate four-wave-mixing (DFWM) spectroscopy to measure the rotational distribution of transient formed NaH molecules in the Na(3p)-H2 collision system applying a recently developed new method for the correct consideration of the transition dipole moment. Considering the NaH molecule as a thermometric species, we found high rotational temperatures differing significantly from the oven temperature by up to 80%. For comparison the revealed temperatures were also determined with linear absorption measurements giving excellent agreement between the two methods. The increased temperatures are explained by a spatially localized heating mechanism which is caused by kinetic energy transfer between Na(3p) and H2. A rate equation model, which includes quenching and reaction processes, agrees satisfactorily with all types of chosen parameters, including different sodium excitations as well as different cell temperatures.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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