title: Two-photon-excited fluorescence measurement of hydrogen atoms in flames.
abstract: We report the first two-photon-excited hydrogen-atom fluorescence measurements in flames made to our knowledge. The n = 3 level of the H atom was excited by 205.1-nm radiation generated by Raman shifting a 224-nm beam produced by frequency mixing. Fluorescence was observed at 656.3 nm as a result of radiative decay from n = 3 to n = 2, the Balmer-alpha transition. A novel technique, photoionization-controlled loss spectroscopy, is proposed to eliminate the quenching dependence of the fluorescence signal.
authors.forename: R P
authors.initials: RP
authors.lastname: Lucht
authors.forename: J T
authors.initials: JT
authors.lastname: Salmon
authors.forename: G B
authors.initials: GB
authors.lastname: King
authors.forename: D W
authors.initials: DW
authors.lastname: Sweeney
authors.forename: N M
authors.initials: NM
authors.lastname: Laurendeau