Abstract
We test the laser atomic absorption spectroscopy as a method to measure the population density of the 2 3S level in an energetic He4 beam. The 2 3S projectiles are produced by quasiresonant charge transfer collisions of He+ in lithium vapor. The population density is measured with a tunable distributed Bragg reflector diode laser operating at 1083 nm. The absorption of the 2 3 S →2 3Pj transitions yields an absolute value for the line-integrated density, and from the knowledge of the radial beam particle density profile the density of the 2 3S state itself is obtained.
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