Determination of the atomization energies of the molecules CSe(g) and CSe2(g) by the mass spectrometric Knudsen cell method

Abstract

The atomization energies, D^°₀(CSe)= 140.2 ± 1.4 kcal mol^–1, D^°_{at, 0}(CSe₂)= 225.4 ± 1.7 kcal mol^–1 and the standard enthalpies of formation of the molecules CSe(g) and CSe₂(g) were determined by the mass spectrometric Knudsen cell method in the temperature interval 1550–1870 K. The thresholds for dissociative ionization towards CSe⁺, Se⁺ and Se⁺₂ under photon impact, confirm the atomization energies of CSe₂(g) and CSe(g). Chemiluminescence from vibrationally excited CO formed by reaction of atomic oxygen with CSe₂ is discussed in connection with the above results.