High-brightness cm-1-resolution threshold photoelectron spectroscopic technique

摘要

We first describe some characteristics of our compact photoelectron analyzers capable of high-resolution (1 - 2 cm$+$MIN@1$/) cation spectroscopy of molecules in two-color (approximately ega$-1$/, approximately ega$-2$/) laser experiments of resonantly enhanced multiphoton ionization. Threshold ionization photoelectrons lower than a few cm$+$MIN@1$/ are collected as a function of approximately ega$-2$/ by applying a pulsed electric field at 500 ns at each laser shot, while energetic photoelectrons are removed by angular- and time-resolved discrimination. Second, we demonstrate a rotational spectrum due to NO$+$PLU$/ obtained by this technique to examine our energy resolution. Third, we mention a few examples of low-frequency vibrational spectra of cation radicals: (1) rotational isomers, (2) Ar-NO van der Waals complex, and (3) aniline-Ar$-n$/ complexes (n $EQ 1,2).