However, in the line wings, where the optical depth is lower, radiation of the hot arc center can escape forming self-reversal maxima.
Radially resolved spectral measurements were performed in the middle of the lamp, where high spectral resolution is necessary in order to detect and resolve the self-reversal line structure.
The self-reversal is characterized by the double peak structure with minimum intensity near the central wavelength.
Since the radiance of the self-reversal maxima is crucial for temperature evaluation with Bartels method, care must be taken in the determination of that radiance value.
46 the radiance of self-reversal maxima is reduced by around 14 percent, which must be considered before evaluation.
By extrapolation one obtains a background contribution to the blue self-reversal radiance of the Sc I line at 474.
To resolve self-reversal line contours usually one needs sufficient high spectral resolutions.
Hence the total experimental radiance uncertainty of self-reversal maxima is estimated to be less than 18 percent in case of Sc lines and less than 16 percent in case of Hg lines.
In M enters the so-called far line wing approximation, which requires a well developed self-reversal, allowing to separate the profile function into a product of a frequency dependent and a position dependent term.
In this case equations (2) and (3) lead to a very simple and direct representation of the plasma temperature as a function of the self-reversal radiance for the Hg I 435.
Court of Appeals for the District of Columbia Circuit, who wrote the February decision and the May self-reversal
, acknowledged error in his initial ruling, and adopted the Time's standard for assessing opinion in the context of a critical review.