title: On the adiabatic ionization energy of the propargyl radical.
abstract: The photoionization and pulsed-field-ionization zero-kinetic-energy photoelectron spectra of the propargyl radical have been recorded in the vicinity of the origin of the X(+) (1)A1←X(2)B1 photoionizing transition. An internally cold sample of propargyl with a rotational temperature of ~45 K was produced in a supersonic expansion of 1,3-butadiene in helium. Propargyl was generated by excimer laser (ArF, 193 nm) photolysis of 1,3-butadiene in a quartz capillary mounted at the exit of a pulsed valve. The rotational structure of the origin band of the photoelectron spectrum was partially resolved and an improved value of the adiabatic ionization energy of propargyl (E(I)/hc = 70174.5(20) cm(-1)) was determined.
authors.affiliation: Laboratorium für Physikalische Chemie, ETH Zürich, CH-8093 Zurich, Switzerland.
authors.forename: U
authors.initials: U
authors.lastname: Jacovella
authors.forename: B
authors.initials: B
authors.lastname: Gans
authors.forename: F
authors.initials: F
authors.lastname: Merkt