Abstract
We report 62 new experimentally obtained transition probabilities (oscillator strengths) for doubly ionized krypton within the ultraviolet wavelength region (213 – 362) nm. The transition probabilities were obtained combining measured intensities of spectral lines emitted by a plasma generated in a low-pressure pulsed arc with theoretical oscillator strengths of 12 lines used as a reference. The plasma temperature ranged from 26,200 to 29,200 K and the electron density was in the range (1.7−3.2)×1022 m−3.
Highlights
Krypton (Z=36) is of great importance as an inert working gas in spectral lamps [1], lasers [2], and in fusion plasmas [3], where impurities of noble gases such as neon, argon and krypton provide transitions used for plasma diagnostics [4]
This paper reports 62 new experimental values of absolute transition probabilities for spectral lines of doubly ionised Krypton (Kr III) in the ultraviolet wavelength region 213 – 362 nm
We obtained the new transition probabilities from measured relative line intensities that we converted to absolute units using the theoretical oscillator strengths from [17]
Summary
Krypton (Z=36) is of great importance as an inert working gas in spectral lamps [1], lasers [2], and in fusion plasmas [3], where impurities of noble gases such as neon, argon and krypton provide transitions used for plasma diagnostics [4]. For example, theoretically calculated transition probabilities do not have the accuracy needed to analyse high-resolution astronomical spectra [13] and experimental spectroscopy requires manpower and time, which limits the quantity of data that can be produced. Due to the absence of experimental transition probabilities for Kr III in the spectral region under study, we have used the theoretical oscillator strengths of Raineri et al [17] (converted to transition probabilities) to derive the excitation temperature of our plasma source. We used a two-wavelength interferometric method to determine the electron density, which was in the range of (1.7 − 3.2) × 1022 m−3
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