Internal state populations and velocity distributions of monatomic species ejected after the 1064 nm laser irradiation of barium

MAXIMILIANO ROSSA; CARLOS A. RINALDI; JUAN C. FERRERO

AMER INST PHYSICS

Año: 2009 vol. 105 p. 6330601 - 6330601

p style="text-align: justify; line-height: 200%; margin: 0in 0in 0pt;" class="MsoNormal">The plumes accompanying 1064 nm nanosecond pulsed laser ablation of barium in vacuum at three moderate incident laser fluences in the range of 5.3-10.8 J/cm2 have been studied using both wavelength and time resolved optical emission spectroscopy and time-of-flight laser-induced fluorescence. Neutral atoms and both singly and doubly charged monatomic cations in excited states up to near the corresponding ionization limits are identified in the optical emission spectra. The population distributions of low-lying (£1.41 eV) ?dark? states of Ba atoms measured by laser-induced fluorescence revel that the metastable 3D