@inproceedings{8987484bb81c4f368d4fdf919d89e0b9,
title = "Two-photon spectroscopy of atoms and molecules.",
abstract = "The advantages of two-photon spectroscopy are discussed, and a study showing that it can utilize a very weak light source (105-106 photons) with nearly unit efficiency and yield useful spectroscopic information is reported. The third harmonic (355 nm) from a Nd:YAG laser is used to pump a dye laser and simultaneously produce coherent vacuum ultraviolet light (VUV) at a fixed wavelength of 118 nm in a generation cell. The dye laser is tuned to the appropriate wavelength to excite the species of interest in a detection cell. The excited species is subsequently ionized, and the ejected electron is detected by parallel plates. The laser schemes for VUV generation in xenon and (2 + 1) ionization of molecular hydrogen are shown. As the ionization step involves only one photon, this process can be easily ionized so that the signal is directly proportional to the two-photon absorption rate. The two-photon absorption rate constants and the in vacuo transition energies as well as spectra of argon and hydrogen are presented. The results agree well with other published results.",
author = "McCann, {M. P.} and Chen, {C. H.} and Payne, {Marvin G.}",
year = "1988",
language = "English",
isbn = "155752033X",
series = "CLEO 88 Conf Lasers Electro Opt 1988 Tech Dig Ser Vol 7",
publisher = "Publ by IEEE",
pages = "318, 319",
booktitle = "CLEO 88 Conf Lasers Electro Opt 1988 Tech Dig Ser Vol 7",
}