The collisional quenching of electronically excited arsenic atoms As(42DJ) and As(42PJ), studied by time-resolved attenuation of atomic resonance radiation

✍ Scribed by M. J. Bevan; D. Husain

• Publisher: John Wiley and Sons
• Year: 1975
• Tongue: English
• Weight: 649 KB
• Volume: 7
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.550070108

✦ Synopsis

A kinetic investigation of electronically excited arsenic atoms in the low-lying states, As(4ps ' 0 5 ) and As(4p3 2P~), ca. 1.33 and 2.28 eV, respectively, above the 44S312 ground state, has been carried out by atomic absorption spectroscopy. Atoms in these optically metastable states were generated by the pulsed irradiation of suitable arsenic compounds (AsMea for 2D and AsCl3 for "p) in different spectral regions and monitored photoelectrically by time-resolved attenuation of atomic resonance radiation. Rate constants for the deactivation of these two states are reported for a range of collision partners. The data are compared with those of the analogous states of lighter atoms in group V, namely, P(32D~r, 3 2 P ~) and N ( 2 2 D ~, 2'PJ), and discussed in terms of spin and orbital symmetry considerations.

'A'+2A"

As(4*DJ) + COz -AsO(XZII) + CO(X'Z+) AH > -0.86 eV