Rotational-level-dependent quenching of A 2Sigma + OH and OD
Abstract
Rate constants kQ for collisional quenching of A 2Σ+, v'=0, OH and OD have been measured for specific rotational levels N' of the radical and a wide variety of collision partners. Through measurements of the time-dependent laser-induced fluorescence in a low pressure discharge flow at room temperature, we observe a decrease in kQ with increasing rotational quantum number for most quenchers. The internal levels of the collision pairs appear unimportant from experiments involving deuterium substitution. A comparison of rotationless rates for different colliders [kQ(N=0)] with calculations based on collision complex formation indicate that attractive forces play a role in the quenching process.
- Publication:
-
Journal of Chemical Physics
- Pub Date:
- May 1985
- DOI:
- 10.1063/1.448843
- Bibcode:
- 1985JChPh..82.4022C
- Keywords:
-
- Atomic Collisions;
- Electron States;
- Ground State;
- Hydroxyl Radicals;
- Quenching (Atomic Physics);
- Rotating Matter;
- Decay Rates;
- Fluorescence;
- Laser Induced Fluorescence;
- Lasers;
- Particle Spin;
- Pressure Dependence;
- Vibration Effects;
- Atomic and Molecular Physics