Collisional quenching of high rotational levels in A 2Σ+ OH

摘要: Collisional removal of the v′=0 level A 2Σ+ state OH radical has been studied as a function rotational N′ at room temperature. in high levels X 2Πi were created by 193 nm photolysis HNO3 and excited to tunable dye laser. Time decays fluorescence varying pressures measured. For O2 H2, quenching cross section σQ decreased with increasing until N′∼10; for higher it appears remain approximately constant. Xe behaves same way except that decrease continues N′=15. Kr, within experimental error zero N′=10; N2 was above N′=10. These results have implications laser-induced atmospheric monitoring combustion temperature determinations, well fundamental understanding collisional quenching. Quenching OH, N′∼1, found be 81±8 A2.