Zero kinetic energy electron spectra of aniline are recorded and a number of ion vibrational frequencies accurately measured. The adiabatic ionization potential of aniline is found to be 62 271±2 cm−1. Ab initio calculations provide insights into the bonding changes that take place in aniline upon ionization. Reasonable agreement between calculated and measured frequencies in the ground states of aniline neutral and ion is obtained.

Experiments involving the adsorption of gas phase molecules onto thin metal films and the subsequent desorption and ionization of these species are described. The observed ion yield displays a rather striking laser pulse repetition rate dependence that can be interpreted using a simple model that quantitatively analyzes the competition between collisional adsorption and laser induced desorption.

ChemInformVolume 21, Issue 47 Article ChemInform Abstract: Kinetic Energy Distributions of Aniline Molecules and Cations Following Their UV-Laser-Induced Desorption from a Metal Surface M. YANG, M. YANG Dep. Chem., Indiana Univ., Bloomington, IN 47405, USASearch for more papers by this authorJ. P. REILLY, J. P. REILLY Dep. Chem., Indiana Univ., Bloomington, IN 47405, USASearch for more papers by this author M. YANG, M. YANG Dep. Chem., Indiana Univ., Bloomington, IN 47405, USASearch for more papers by this authorJ. P. REILLY, J. P. REILLY Dep. Chem., Indiana Univ., Bloomington, IN 47405, USASearch for more papers by this author First published: November 20, 1990 https://doi.org/10.1002/chin.199047053Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume21, Issue47November 20, 1990 RelatedInformation

Two different methods of UV laser-induced desorption ionization are compared by measuring the dependence of each on the laser pulse repitition rate. At an aniline sample pressure of 2.3 × 10-8 torr, the ionization signal obtained with a prism internal reflection geometry increases linearly with the time between laser pulses. In contrast, the signal obtained with light incident on the surface from the gas phase side is independent of the laser repetition rate, as in conventional gas phase ionization experiments. These observations, in conjunction with measurements of the time of flight peak distribution, enable us to ascertain the locations where ionization takes place in the two experiments. UV laser-induced surface ionization with prism internal reflection is found to be appropriate for studying adsorption/desorption kinetics in experiments where gas phase molecules are continuously adsorbing and desorbing from a metal surface.

UV laser-induced surface ionization with prism internal reflection is demonstrated to be a useful ion source for the Time-of-Flight mass spectrometer (TOF-MS). Spraying aniline (93 amn) on the prism surface and using 2 ns UV laser pulses, mass resolutions of 3900 and 11000 have been achieved in a linear TOF-MS and a reflectron TOF-MS, respectively. Theoretical calculations indicate that mass resolution of over one million is possible, if a picosecond laser and appropriate electronics are employed.