Abstract
Transition lines of neutral arsenic atom (As I) have been observed in the spectra of stellar and sub-stellar objects. Accurate and reliable data of oscillator strengths of those transitions allow differentiating between different evolution models of those objects. We have measured branching fractions for As I (4p25s-4p3) transition lines in 180–310 nm spectral range with higher increased accuracy using light source powered by inductively coupled radio frequency plasma (RF-ICP) source – not earlier applied in studies of atomic arsenic. The measurements were performed for 7 excited states of As I and compared with data from the literature. We combined them with the selected lifetime values reported in the literature. The transition probabilities for 26 spectral lines are obtained and compared with other experimental and theoretical data from literature. The absorption oscillator strengths for two As I (4p25s-4p3) resonance transitions (197.3 nm, f = 0.127, and 193.8 nm f = 0.059) are also reported.
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