What do the black lines on an absorption line spectrum represent?
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210 Citations | Most of our observed lines show complex profiles due to an interplay between emission and absorption features, and we suggest a two-dimensional classification scheme to describe these line profiles, based on the relative height of a secondary peak to the primary peak, as well as whether the absorption is blue- or red-shifted. |
| The “conjugate” nature of these lines, with one line in emission and the other in absorption, but with the same shape, implies that the lines arise in the same gas. | |
| This technique enables overlapping line absorption to be considered for arbitrary spectral correlation of the monochromatic absorption cross sections of the individual gases. | |
56 Citations | The results show that the serious self-absorption of spectral lines (Na and K) was reduced. |
| These results support the idea that absorption line variability is driven mainly by changes in the gas ionization in response to continuum variations, that the line-absorbing gas is highly ionized, and in some extreme cases, too highly ionized to be detected in UV absorption lines. | |
19 Citations | To our knowledge, this is the first frequency measurement of saturated absorption lines in ammonia at near infrared frequencies and the first reported observation of saturated absorption lines in the ν1+2ν4 band. |
44 Citations | This is because current models of the spectral lineshape in this band do not properly account for the significant absorption that exists far from the centers of saturated lines. |
14 Citations | Additional unclassified absorption lines may possibly originate from transitions from the ground state to Rydberg states. |
| Although the total line shape has limitations, it does demonstrate the importance of considering far wings of absorption lines in continuum absorption. |
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