Publikace ÚTF

In a combined experimental and theoretical study, we probe the vibrational excitation of isocyanic acid induced by electron impact in the energy range up to 5 eV. Experimentally, we report differential elastic and vibrationally inelastic cross sections at the scattering angle of 135◦. Theoretically, we characterize the involved resonant states using a regularized analytical continuation method. We also apply a nonlocal resonance model to calculate cross sections for the vibrational mode that involves the N-H stretching motion. The model reproduces all the features observed in the experiment: efficient excitation at the threshold, sharp cusps in the excitation functions, and the formation of an A' shape resonance. There is a second (A'') resonance visible in the spectra; however, it excites
only selected vibrational modes. The origins of this selectivity are discussed.