title: Hydrogen alpha laser ablation plasma diagnostics.
abstract: Spectral measurements of the H(α) Balmer series line and the continuum radiation are applied to draw inferences of electron density, temperature, and the level of self-absorption in laser ablation of a solid ice target in ambient air. Electron densities of 17 to 3.2×10(24) m(-3) are determined from absolute calibrated emission coefficients for time delays of 100-650 ns after generation of laser plasma using Q-switched Nd:YAG radiation. The corresponding temperatures of 4.5-0.95 eV were evaluated from the absolute spectral radiance of the continuum at the longer wavelengths. The redshifted, Stark-broadened hydrogen alpha line emerges from the continuum radiation after a time delay of 300 ns. The electron densities inferred from power law formulas agree with the values obtained from the plasma emission coefficients.
authors.forename: C G
authors.initials: CG
authors.lastname: Parigger
authors.forename: D M
authors.initials: DM
authors.lastname: Surmick
authors.forename: G
authors.initials: G
authors.lastname: Gautam
authors.forename: A M
authors.initials: AM
authors.lastname: El Sherbini