QUENCHING RATES AND FLUORESCENCE EFFICIENCY IN THE ALPHA-2SIGMA+ STATE OF OH

Using direct lifetime measurements at pressures up to 25 Torr, the quenching rates for the A 2∑+(v = 0) state of OH due to N2, O2, H2O, and air have been determined. These values are in general agreement with other direct lifetime measurements obtained in the millitorr range and show that the quenching cross sections are pressure independent. The implications of these values on the previous ambient OH measurements are discussed. © 1979 American Institute of Physics.