The Microwave Spectrum of the Thiophene-Argon van der Waals Complex

Abstract

Abstract The rotational spectra of the 32 S-and 34 S-thiophene-argon complex have been studied in the microwave region between 6 and 18 GHz using a pulsed molecular beam Fourier transform micro-wave spectrometer. The rotational and centrifugal distortion constants of the 32 S-thiophene-argon complex were found to be A = 3280.38865(15) MHz, B = 1203.32018(15) MHz, C = 1123.45120(11) MHz, Δ J = 3.3311 (33) kHz, Δ JK = 16.9015(31) kHz, Δ K = -18.302(14) kHz, δ j = 0.235074(86) kHz, δ K = 4.340(33) kHz. For the 34 S-isotopomer A = 3231.16878(15) MHz, B = 1194.05602(58) MHz and C = 1109.53497(30) MHz with almost the same centrifugal distortion constants were obtained. The argon atom is placed 3.59 Å above the ring plane.