3. |
- Rojas, Dorys, et al.
(författare)
-
An investigation of the 2f—wavelength modulation technique for detection of atoms under optically thin as well as thick conditions
- 1997
-
Ingår i: Spectrochimica Acta Part B - Atomic Spectroscopy. - : Elsevier. - 0584-8547 .- 1873-3565. ; 52:11, s. 1663-1686
-
Tidskriftsartikel (refereegranskat)abstract
- An investigation of the 2f-wavelength modulation (WM) technique for detection of atoms under optically thin as well as thick conditions is presented. A program that simulates the entire process of laser light modulation, atomic absorption and signal demodulation has been constructed. The dependence of the 2f-WM signal upon frequency amplitude modulation and detuning for a variety of atomic masses (i.e. optical densities) is investigated in detail. It is shown, among other things, that the 2f-WM (S(bar)2f-r) signal strength is either a dual-or a quadrupled valued function of optical density. Despite this, it shown that the 2f-WM technique can be used, by suitable choices of the frequency amplitude modulation and detuning, for detection of atoms also under optically thick conditions.
|
|