Abstract book - Prof. Per Jensen, Ph.D. - Bergische Universität ...

Poster session, J18 181Applications of the High-Precise THz Nonstationary SpectroscopyVladimir L. Vaks, Elena G. Domracheva, Sergey I.Pripolzin, Ekaterina A.Sobakinskaya, Mariya B. ChernyaevaInstitute for Physics of Microstructures RAS, Russia, elena@ipm.sci-nnov.ruOver the last twenty years the terahertz (THz) frequency range has gained popularity allaround the world. Many groups in different countries have focused their efforts ondevelopment and elaboration of THz technique and its applications to various problems.The method of THz spectroscopy is based on nonstationary effects (free dampingpolarization, fast frequency sweeping). The periodic switching the phase (or frequency)of radiation interacting in resonance with the medium leads to rising the processes oftransient radiation and absorption, periodic appearing and decaying the macroscopicpolarization induced. The resulting transient signals are recorded and accumulated in thereceiving part of the spectrometer. The value and shape of these signals are used forhigh-accuracy determination of concentration of components in the gas mixture. Theresults of application of THz gas spectrometers for different applications such asmedicine, safety systems, hi-tech et al. are presented in this paper.The THz nonstationary spectrometer has been also employed for studying explosivesvapours compositions. The absorption lines of characteristical products (chloromethane,aldehydes, nitriles, etc.) of decomposing the 2- Chlorovinyldichloroarsine in gaseousphase are measured. The marker-substances for detection of TNT, NG, etc. aredetermined.The THz nonstationary gas spectroscopy can be used for monitoring the hi-techprocesses in situ. The investigation of the composition of CH- plasma at diamond filmsCVD was carried out.The THz nonstationary gas spectroscopy was used for precise measurements of freonesimpurities in isotopic enriched tetrafluorosilaneTHz spectrometer was used for noninvasive medical diagnostics. The experimentalinvestigations of the NO concentration dynamics in the exhaled air of oncologicalpatients under the radiotherapy course were carried out. An increase of NOconcentration (in 2-3 times) in exhaled breath of lung cancer patients after a session ofradiation therapy was demonstrated.Investigation of the NH 3 concentration in gastrointestinal tract based on exhalationanalysis in 115-185 GHz and 500-1200 GHz frequency ranges was performed.The measurements of absorption lines of acetone, methyl and ethyl alcohols a in modelmulti-component air-acetone gas mixture with different components concentrations andin exhaled air for diagnostics of diabetes were carried out.Investigation of the state of transplants (liver, kidneys) on spectroscopic characteristicsof custodiol was carried out using IR Fourier spectroscopy and nonstationary THz gasspectroscopy in three frequency ranges: 565-568 GHz, 571- 572 GHz и 573 – 574 GHzfor detection of spectral lines which were markers of state of investigated organ.The work is supported by RFBR: projects 10-08-01124-a, 11-02-97051-r_povolje_a,11-02-12203-ofi-m_a, 11-02-12195-ofi-m_a; Program of the Presidium RAS “Thefundamental basis of nanostructures and nanomaterials technologies”; Teradec047.018.005, Project NATO.EAP.SFPP 984068.Vaks V.L.Domracheva E.G.Pripolzin S.I.Sobakinskaya E.A.Chernyaeva M.B.