The photolysis at 193 and 222 nm of matrix-isolated cyanoacetylene yie
lds isocyanoacetylene, identified by its stretching fundamentals. Anot
her carbene isomer, HNCCC, has been tentatively identified. The possib
ility of CCCN radical detection is discussed. (C) 1997 Elsevier Scienc
e B.V.