Occurs when a sample is irradiated with a
laser beam. In the
irradiation of gaseous samples,
ionization occurs
via a single- or multi-photon process. In the case of solid samples,
ionization occurs
via a thermal process.
Source:
PAC, 1991, 63, 1541
(Recommendations for nomenclature and symbolism for mass spectroscopy (including an
appendix of terms used in vacuum technology). (Recommendations 1991))
on page 1548