Laser photodetachment determination of the electron affinities of OH, NH2, NH, SO2, and S2

摘要

Using a fixed frequency argon ion laser we have studied the energy spectra of electrons photodetached from OHminus;,NH2minus;, NHminus;,SO2minus;, andS2minus;. We determined the following electron affinities:EAlpar;OHrpar;equals; 1.829minus;0.014plus;0.010thinsp;eV,EA(NH2)equals;0.779plusmn;0.037 eV,EA(NH)equals;0.38plusmn;0.03 eV,EA(SO2)equals;1.097plusmn;0.036 eV, andEA(S2)equals;1.663plusmn;0.040 eV. Additionally, the angular distribution anisotropy parameter bgr; was measured for OHminus;andNH2minus;at 4880 Aring;, as minus;0.993 plusmn; 0.040, and 0.027plusmn;0.012, respectively, and information about negative ion vibrational constants is presented.