Relative Transition Probabilities for Prominent NI I and NI II Lines in the Near Ultraviolet.

Abstract

view Abstract Citations References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Relative Transition Probabilities for Prominent NI I and NI II Lines in the Near Ultraviolet. Bell, G. D. ; Paquette, D. R. ; Wiese, W. L. Abstract Relative transition probabilities of 16 Xi I lines and 53 Ni II lines in the wavelength range from 2000-3600 A have been measured with a wall-stabilized arc. The arc was operated at 10 A in argon with a small admixture (0.01 %) of nickelcarbonyl. The spectrum was photoelectrically observed along the arc axis through the hollow electrodes. The relative intensity calibrations were performed by utilizing calibrated tungsten strip lamps or the continuous emission of a hydrogen arc operated at known plasma conditions. The axis temperature of the argon nickel-carbonyl arc was determined from intensity measurements of argon lines of known transition probabilities and the application of the arc plasma equations. For most of the relative f values the experimental and theoretical uncertainties are 8% or better, but for a few weak lines the uncertainties go as high as 30%. Comparisons with other experimental and theoretical results are undertaken and fair agreement is obtained. The relative f values for both the Xi I and Ni II lines have been put on an absolute scale by using the absolute oscillator strengths of a few prominent Xi I lines recently reported by Lawrence, Link, and King (Astrophys. J. 141, 293,1965). This work was supported in part by the Advanced Research Projects Agency. Publication: The Astronomical Journal Pub Date: February 1966 DOI: 10.1086/110001 Bibcode: 1966AJ.....71Q.156B full text sources ADS |