THE PFI-ZEKE SPECTROSCOPY STUDY OF HfS$^{+}$ AND THE IONIZATION ENERGY OF HfS

Abstract

Spectroscopic data for the ground and low-lying states HfS$^{+}$ have been obtained using the technique of pulse field ionization - zero electron kinetic energy (PFI-ZEKE) spectroscopy. PFI-ZEKE spectra were recorded for the levels X$^{2}$\Sigma$^{+}$ (v=0-18), $^{2}$\Delta$_{5/2}$ (v=0-8) and $^{2}$\Delta$_{3/2}$ (v=0-3). Assignments of the electronically excited states of HfS$^{+}$ are based on CCSD(T) and DFT calculations with SDB-aug-cc-pVTZ basis set. Rotationally resolved spectra were recorded for the X$^{2}$\Sigma$^{+}$ (v=0) state using single rotational line excitation of the intermediate state. The ionization energy for HfS, term energies and molecular constants for the ground and low-lying states of HfS$^{+}$ will be reported.