TY - JOUR
T1 - VUV photoionization of acetamide studied by electron/ion coincidence spectroscopy in the 8-24 eV photon energy range
AU - Schwell, Martin
AU - Bénilan, Yves
AU - Fray, Nicolas
AU - Gazeau, Marie Claire
AU - Es-sebbar, Et-touhami
AU - García, Gustavo A.
AU - Nahon, Laurent
AU - Champion, Norbert
AU - Leach, Sydney Sydney
N1 - KAUST Repository Item: Exported on 2020-10-01
PY - 2012/1
Y1 - 2012/1
N2 - A VUV photoionization study of acetamide was carried out over the 8-24 eV photon energy range using synchrotron radiation and photoelectron/photoion coincidence (PEPICO) spectroscopy. Threshold photoelectron photoion coincidence (TPEPICO) measurements were also made. Photoion yield curves and branching ratios were measured for the parent ion and six fragment ions. The adiabatic ionization energy of acetamide was determined as I.E. (1 2A′) = (9.71 ± 0.02) eV, in agreement with an earlier reported photoionization mass spectrometry (PIMS) value. The adiabatic energy of the first excited state of the ion, 1 2A″, was determined to be ≈10.1 eV. Assignments of the fragment ions and the pathways of their formation by dissociative photoionization were made. The neutral species lost in the principal dissociative photoionization processes are CH 3, NH 2, NH 3, CO, HCCO and NH 2CO. Heats of formation are derived for all ions detected and are compared with literature values. Some astrophysical implications of these results are discussed. © 2011 Elsevier B.V. All rights reserved.
AB - A VUV photoionization study of acetamide was carried out over the 8-24 eV photon energy range using synchrotron radiation and photoelectron/photoion coincidence (PEPICO) spectroscopy. Threshold photoelectron photoion coincidence (TPEPICO) measurements were also made. Photoion yield curves and branching ratios were measured for the parent ion and six fragment ions. The adiabatic ionization energy of acetamide was determined as I.E. (1 2A′) = (9.71 ± 0.02) eV, in agreement with an earlier reported photoionization mass spectrometry (PIMS) value. The adiabatic energy of the first excited state of the ion, 1 2A″, was determined to be ≈10.1 eV. Assignments of the fragment ions and the pathways of their formation by dissociative photoionization were made. The neutral species lost in the principal dissociative photoionization processes are CH 3, NH 2, NH 3, CO, HCCO and NH 2CO. Heats of formation are derived for all ions detected and are compared with literature values. Some astrophysical implications of these results are discussed. © 2011 Elsevier B.V. All rights reserved.
UR - http://hdl.handle.net/10754/566053
UR - https://linkinghub.elsevier.com/retrieve/pii/S0301010411005271
UR - http://www.scopus.com/inward/record.url?scp=84855590658&partnerID=8YFLogxK
U2 - 10.1016/j.chemphys.2011.11.032
DO - 10.1016/j.chemphys.2011.11.032
M3 - Article
SN - 0301-0104
VL - 393
SP - 107
EP - 116
JO - Chemical Physics
JF - Chemical Physics
IS - 1
ER -