Absolute photodetachment cross section measurements of the 0-and OH- anion

摘要

Absolute total photodetachment cross sections of 0- and OH- anions stored in a multipole radiofrequency trap have been measured using a novel laser depletion tomography method. For OH- thetotal cross sections of 8.5(1) ( )stat .3, syst and 8.1(1)(7)stat syst X 10-1s cm2, measured at 662 and 632 nm,respectively, were found constant in the temperature range of 8-300 K. The 0- cross sections5.9(1)stat(2)syst and 6.3(1)stat(2)syst X 10-18 cm2 measured at 170 K at 662 and 532 nm, respectively,agree within error estimations with preceding experiments and increase the accuracy of the widelyused calibration standard for relative photodetachment measurements of diverse atomic andmolecular species.