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130 Poster session, H17Hyperfine splittings in CH 3 F induced by the Stark effectJindřich Koubek, Patrik Kania, Štěpán UrbanInstitute of Chemical Technology, Prague, Czech Republic, jindrich.koubek@vscht.czCH 3 F Stark transitions of the pure rotational line J: 1→2, K: 1→1 with largest Starkshift (M: −1→ −1 and M: 1→ 1 for parallel set-up, M: −1→ 0 and M: 1→ 0 fororthogonal set-up) were measured in an absorption free path cell using frequencymodulation, at pressure of 7 μbar and under electric field intensity ranging from cca 10to 1100 V/cm. Since the experiment is Doppler limited, no spin-rotational splitting dueto the hydrogen or fluorine nuclei was observed in pure rotational lines and wasexpected to appear neither in the selected Stark lines that serve in calibration of Starkinstruments. Nevertheless the measured spectrum features a splitting in these Starkcomponents, a splitting that linearily increases with electric field intensity. Analysisfollowing articles by Marshall, Wofsy, Muenter and Klemperer 1-2 is in progress.a.u.a.u.0.00004abcdKoubek J.Kania P.Urban S.0.000020.000020.000000.00000-0.00002-0.00002-0.00004f [MHz]101780 101790 101800 101980 101990 102290 102300 102310 102490 1025000.000008a.u.0.000004ef0.000000-0.000004f [MHz]101605 101610 101615 101620 101625 102660 102665 102670 102675 102680Fig.: Hyperfine splittings in CH 3 F J:1→2, K:1→1 Stark transitions M: −1→ −1 (a, b),M: 1→ 1 (c, d), M: −1→ 0 (e) and M: 1→ 0 (f, operational upper frequency limit of theSchottky diod detector causes lower SNR) under external electric field intensity of cca500 V/cm (b, c) and 1100 V/cm (a, d, e, f).AcknowledgmentsThe work was supported through the Grant Agency of the Czech Academy of Sciences(grants P206/10/2182, P206/10/P481), and through the centralized project C70 of theMinistry of Education,Youth and Sports of the Czech Republic.References[1] M. D. Marshall, J. S. Muenter, J. Mol. Spectrosc. 83, 279, 1980[2] S. C. Wofsy, J. S. Muenter, W. Klemperer, J. Chem. Phys. 55, 2014, 1971