NO and CF2 fluorescence during vacuum ultraviolet photodissociation of CF2ClNO

Abstract

Photolysis of CF₂ClNO at 147 and 123 nm results in electronically excited fragments, fluorescence from which is observed. At 147 nm NO (B²Π) is produced, giving rise to the well known NO β-bands, contrasting with previous studies on CF₃NO, in which NO (A²∑⁺) dominated. Addition of non-reactive gases (e.g., He) results in quenching of fluorescence from the higher vibronic levels of the NO (B²Π) state, while at the same time fluorescence from NO(A²∑⁺) becomes increasingly important. Photolysis at 123 nm give a very different emission spectrum, the most important contributor being the (¹B₁) state of CF₂. Ionization also occurs at 123 nm (10.03 eV) with a quantum yield of ca. 0.08. These results are compared and contrasted with data obtained previously for CF₃NO.