New vibronic bands were observed in the 17000-17600 cm(-1) region by laser induced fluorescence (LIF) spectroscopy in the discharged products of a mixture of C,H, and CS, it) a supersonic jet, The effective rotational constants and the position of the vibronic band origin have been determined to be B"(ctt) = 0,0191W2) cm(-1). B"(ctt) = 0,01891(2) cm-1, and Tu = 16961,5161(5) cm(-1), respectively, The spectral carrier of the bands has been confirmed to be the HC6S radical from the chemical behavior of the products and the determined rotational constant. (C) 2002 Elsevier Science B.V. All rights reserved.