Absorption spectrum of very low pressure, relatively cold atomic hydrogen: Lyman forest and Karlsson's formula.
Abstract
Light of a very hot blackbody crosses assumed pure, very low pres- sure, relatively cold (20 000K) atomic hydrogen. Absorption of Lyman lines generates states in which periods of quadrupolar resonances are longer than the lengths ( 1 ns) of pulses which make incoherent light. Assuming that collisional time is also longer than 1 ns, an "impulsive stimulated Raman scattering" (ISRS) decreases frequencies of light until a strongly absorbed line gets Lyman alpha frequency. As long as fall of radiance resulting from Planck's law does not reach Lyman beta frequency, states of principal quantum number n larger than 1 pro- vide a weak frequency shift or feed n=1 states, so that an oscillation occurs, which adds relative frequency shifts putting absorbed Lyman beta and gamma lines to Lyman alpha frequency. Lyman forest and Karlsson's formula are obtained.
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