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NONLINEAR SPECTROSCOPY: EXPERIMENTS WITH MOLECULES IN A TWO COLOUR RESONANT IR RADIATION FIELD AND THE THEORETICAL MODELLING BASED ON THE OPTICAL BLOCH EQUATION.

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/29663

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dc.creator Sartakov, Boris G. en_US
dc.creator Van Opbergen, M. en_US
dc.creator Linskens, A. en_US
dc.creator Holleman, I. en_US
dc.creator Dam, N. en_US
dc.creator Reuss, J. en_US
dc.date.accessioned 2007-11-20T17:09:42Z
dc.date.available 2007-11-20T17:09:42Z
dc.date.issued 1995 en_US
dc.identifier 1995-RH-07 en_US
dc.identifier.uri http://hdl.handle.net/1811/29663
dc.description $^{\ast}$ General Physics Institute, Vavilov str. 38, 117942 Moscow, Russia $^{\ast}$ Support by NATO collaborative research grant is gratefully acknowledged en_US
dc.description Author Institution: Catholic University of Nijmegen, Toernooiveld, NL - 6525 ED Nijmegen, Netherlands en_US
dc.description.abstract The recent achievements in the nonlinear optics opened the new possibilities in the IR high resolution spectroscopy. In this contribution a two colour spectroscopy of cooled $SF_{6}$ and $C_{2}H_{4}$ seeded to He beam is presented. The molecules were excited by $CW {CO_{2}}$ laser beam crossing the molecular beam. The frequencies of laser beams were tuned near $CO_{2}$ lines by Optoacoustic Modulators (OAM) in the range $\pm 500 MHz$. The spectral resolution 2 MHz was achieved. The excitation spectra were modelled in the frames of dressed state picture (DSP) and optical Bloch equations (OBE). In $C_{2}H_{4}$ the one quantum transition $(\nu = 0, \{4, 1, 3\} \rightarrow \nu = 1, \{5, 0, 5\}$ was investigated. At the moderate intensities of the laser fields $(\nu_{1} and \nu_{2})$ the UP-DOWN-UP - (UDU) scheme of excitation was realized. The P*** \marginpar{*Check**} with the frequencies $\nu_{1}$ and $\nu_{2}$ satisfying the resonant condition $(N + 1)\cdot \nu_{1} - N \cdot \nu_{2} = \nu_{transtition}$ at N = 1 and N = 2 were observed. The AC - Stark shifts of peaks were measured being in the agreement with the results of computer modelling based on OBE. The modelling showed that the increasing of the laser intensities leads to the transition from the UDU picture to the AC - Stark split one photon line picture. In $SF_{6}$ the two quantum ladder type transitions $(\nu_{3} = 0, J = 4 \rightarrow \nu_{3} = 1, J = 3\to \nu_{3} = 2, J = 3)$ were investigated. The frequency $\nu_{1}$ was varied near the frequency of the first transition while $\nu_{2}$ was varied near as the frequency of the second transition and the frequency of the two photon transition. The peaks of the dressed states were observed and the AC - Stark shifts of different M - components were measured. The variation of the intensities of peaks due to the interference of many paths of excitation was observed. The DSP was used for the qualitative analysis of the interference effect and the quantitative modelling was based on OBE. The good agreement between measured and simulated spectra was achieved. en_US
dc.format.extent 79829 bytes
dc.format.mimetype image/jpeg
dc.language.iso English en_US
dc.title NONLINEAR SPECTROSCOPY: EXPERIMENTS WITH MOLECULES IN A TWO COLOUR RESONANT IR RADIATION FIELD AND THE THEORETICAL MODELLING BASED ON THE OPTICAL BLOCH EQUATION. en_US
dc.type article en_US