Ultraviolet absorption spectrum of cyclic CS2 in solid Ar

Linear CS2 dispersed in solid Ar was irradiated with an excimer laser at 193 nm to form cyc-CS2 of which infrared (IR) identification and theoretical calculations were reported previously. We recorded an ultraviolet (UV) absorption spectrum with two progressions (330-380 nm) that correlate well with variations in intensities of IR absorption of cyc-CS2 upon photolysis of linear CS2 at various stages; hence we assign it to electronic transitions of cyc-CSz. Based on theoretical calculations and vibronic symmetry, we tentatively assign progression A to transition 2(1)B(2) <-- X(1)A(1) and progression B to 2(1)B(1) <-- X(1)A(1) of cyc-CS2. (C) 2001 Elsevier Science B.V. All rights reserved.