An open-systems approach to calculating time-dependent spectra |
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| Authors: | Martti Havukainen Stig Stenholm |
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| Affiliation: | 1. Helsinki Institute of Physics, University of Helsinki , PO Box 9, FIN-00014, Finland;2. Helsinki Institute of Physics, University of Helsinki , PO Box 9, FIN-00014, Finland;3. Physics Department , Royal Institute of Technology , Stockholm, Sweden |
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| Abstract: | Abstract A new method to calculate the spectrum using cascaded open systems and a master equation is presented. The method uses two-state analyser atoms which are coupled to the system of interest, whose spectrum of radiation is read from the excitation of these analyser atoms. The ordinary definitions of a spectrum uses two-time averages and Fourier transforms. The present method uses only one-time averages. The method can be used to calculate time-dependent as well as stationary spectra. |
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