Laboratorium für Physikalische Chemie, ETH Zürich, CH-8093 Zurich, Switzerland.
J Chem Phys. 2013 Aug 28;139(8):084308. doi: 10.1063/1.4818982.
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.
炔丙基自由基的光致电离和脉冲场电离零动能光电离谱在 X(+) (1)A1←X(2)B1 光致电离跃迁的起源附近被记录下来。炔丙基的内部冷样品以约 45 K 的旋转温度在氦气中的 1,3-丁二烯超音速膨胀中产生。炔丙基通过安装在脉冲阀出口处的石英毛细管中 1,3-丁二烯的准分子激光（ArF，193nm）光解产生。光电离光谱的起源带的转动结构部分得到分辨，并确定了炔丙基的绝热电离能的改进值（E(I)/hc = 70174.5(20) cm(-1)）。
