Multiphoton ionization of N_2 by the third harmonic of a Nd:YAG laser: a new avenue for air diagnostics
- 1 July 1991
- journal article
- Published by Optica Publishing Group in Optics Letters
- Vol. 16 (13) , 1037-1039
- https://doi.org/10.1364/ol.16.001037
Abstract
Ionization of N2 by the third harmonic of a Nd:YAG laser is demonstrated and confirmed experimentally from both spectral and ion-collection measurements. Six photons at 355 nm excite the ground-state neutral molecule to the B2∑u+(υ′=8) ionized state. Intense radiation at 391.4 nm associated with the B2∑u+(υ=0)→X2∑g+(υ″=0) transition was detected. The intensity of this line scales quadratically with the laser power. An ion concentration of 3.25 × 1013 ions/cm3 was detected after irradiation by a 45-mJ laser pulse focused to a diameter of 17 μm. The potential application of this ionization scheme for air velocity and temperature measurements is presented.Keywords
This publication has 9 references indexed in Scilit:
- Detection of nitrogen molecules through multi-photon laser excitation and N+2 fluorescenceOptics Communications, 1988
- Nascent rotational distribution and the relaxation of the N+2 ion produced by double resonant multiphoton ionizationThe Journal of Chemical Physics, 1988
- Determination of the quenching rates of N2+(B2Σu+, ν = 0,1) By N2 using laser-induced fluorescenceChemical Physics Letters, 1983
- Wavelength dependence of raman scattering cross sections from 200-600 nmAIP Conference Proceedings, 1983
- Laser-induced fluorescence in N2 and N+2 by multiple-photon excitation at 266 nmChemical Physics Letters, 1981
- The spectrum of molecular nitrogenJournal of Physical and Chemical Reference Data, 1977
- Laboratory measurements of ionospheric ion‐molecule reaction ratesReviews of Geophysics, 1974
- N2 Vegard–Kaplan System in AbsorptionThe Journal of Chemical Physics, 1969
- Static Temperature Measurements in a Flowing GasPhysics of Fluids, 1962