Affiliation:
1. Department of Chemistry University of San Francisco San Francisco CA 94117 USA
2. Combustion Research Facility Sandia National Laboratories Livermore CA 94551 USA
3. Department of Biological and Chemical Sciences New York Institute of Technology Old Westbury NY 11568 USA
Abstract
AbstractThe absolute photoionization cross section of the monoterpenoid, alpha‐pinene (AP), is presented together with the relative photoionization cross sections of its dissociative fragments for the first time. Experiments are performed via multiplexed vacuum ultraviolet (VUV) synchrotron photoionization (PI) mass spectrometry in the 8.0–11.0 eV energy range. Experimental work is conducted at the Advanced Light Source of the Lawrence Berkeley National Laboratory. Dissociative fragments were identified at m/z 121, 94, 93, 92, and 80. The photoionization cross section for the parent mass at 11.0 eV was determined to be 17±4 Mb with a total ionization cross section of 92±23 Mb at the same photon energy. Experimental appearance energies of dissociative ionization fragments and potential dissociative ionization pathways calculated at the G4 level of theory are presented as well.