Abstract
The adiabatic ionisation energy of CO
, corresponding to the interval between the X
ground state of CO
and the X
ground state of CO
has been determined to be
by pulsed-field-ionisation zero-kinetic-energy photoelectron spectroscopy of a low-pressure CO
gas sample at room temperature. The improved precision and accuracy compared to earlier values result from the use of a multipulse electric-field sequence for the selective ionisation of high Rydberg states and the use of a stationary gas sample to suppress uncertainties from Doppler shifts.
GRAPHICAL ABSTRACT
![](/cms/asset/9318bd55-6820-427f-be3b-537cfefdc26b/tmph_a_1600061_uf0001_oc.jpg)
Acknowledgments
We dedicate this article to Timothy P. Softley and thank him for his inspiring role over many years.
Disclosure statement
No potential conflict of interest was reported by the authors.