Lifetime measurements of some levels of SM I by use of dye laser excitation

Details Lifetime measurements of some levels of SM I by use of dye laser excitation Lifetime measurements of some levels of SM I by use of dye laser excitation

Jan 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....62..245m&link_type=abstract

Astronomy and Astrophysics, vol. 62, no. 1-2, Jan. 1978, p. 245-247. Research supported by the Deutsche Forschungsgemeinschaft.

Astronomy and Astrophysics

Astrophysics

10

Atomic Excitations, Atomic Spectra, Dye Lasers, Laser Outputs, Radiative Lifetime, Samarium, Astrophysics, Atomic Energy Levels, Bandwidth, Fluorescence, Laser Pumping, Pulsed Lasers, Radiation Counters

Scientific paper

Using dye laser excitation, lifetime measurements were made of various levels of neutral samarium in the 21,000-29,000/cm energy range. The levels were populated by the light of a pulsed tunable dye laser pumped by a nitrogen laser. Wavelengths were chosen such that cascade effects could not influence decay curves, and the possibility of two-photon absorption with a subsequent cascade was negligible. The time correlation between excitation and fluorescence was recorded by a multichannel analyzer and a time-amplitude converter. The counting rate (i.e., the ratio of detected photons to exciting laser pulses) was reduced to 1:20 and measured with a control circuit consisting of a pulse stretcher, delay line, and counter. Life-time values were found from the measured decayed curves via a weighted least squares fit accounting for the different relative errors of the points. These values were compared to those obtained via a manual fit to the plotted decay curves and showed good agreement.

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