ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Spatially resolved arc temperatures and sodium density measurements are presented for two high-pressure sodium arcs. Absolute intensities of the optically thick 818/819-nm lines were used to determine the arc temperature while the radial profile of the optically thin 514-nm line was Abel inverted to determine the Na atomic density. Agreement with an independent measurement of the Na density obtained by controlling pressure of sodium in the lamp with a tin bath consistently required a value for the Na 514-nm transition probability 2–3 times smaller than the literature value (A=0.011×108 s−1 ) of Wiese, Smith, and Miles [Atomic Transition Probabilities, NSRDS-NBS 4 (NBS, Washington, DC, 1971), Vol. II], obtained from quantum mechanical calculations. The results of three separate experiments indicate that the value should be modified to A=0.0040×108 s−1 with a standard deviation of ±21%. A more detailed error analysis including systematic error would indicate an accuracy to within ±33%.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.346468
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