| Autor: |
Laws BA; School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia.; Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia., Levey ZD; School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia., Schmidt TW; School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia., Gibson ST; Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia. |
| Abstrakt: |
Weakly bound anionic systems present a new domain for negative ion spectroscopy. Here we report on a multifaceted study of the CH 2 CN - dipole-bound state, employing high-resolution photoelectron spectroscopy from 130 different wavelengths, velocity-map imaging at threshold, and laser scanning photodetachment experiments. This uncovers a wide variety of different vibrational and rotational autodetaching resonances. By examination of both sides of the problem, absorption from the anion to the dipole-bound state and vibrational/rotational autodetachment to the neutral, a complete model of the dipole-bound chemistry is formed. Precise values for the electron affinity EA = 12468.9(1) cm -1 , dipole binding energy D BE = 40.2(3) cm -1 , and anion inversion splitting ω 5 = 115.9(2) cm -1 are obtained. This model is then employed to study possible astronomical implications, revealing good agreement between the K = 1 ← 0 CH 2 CN - dipole transition and the λ8040 diffuse interstellar band. |
