ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
The photodissociation spectrum of SO+2 corresponding to the process SO+2 +hν→SO++O has been measured on a triple quadrupole system for the wavelength ranges: 3000–3400 and 4400–5120 A(ring). The spectrum in the visible has been assigned to the C˜ 2B1←A˜ 2A2 transition and vibrational structure analyzed to yield λ00=4187 A(ring), the harmonic vibrational frequencies ν˜'1=953 cm−1, ν˜''2=499 cm−1, ν˜'1=767 cm−1, and ν˜2 =410 cm−1, and the anharmonicity constants X‘11 =−6.3 cm−1, X''12 =−6.1 cm−1, X‘22 =−4.2 cm−1, X12 =−6.3 cm−1, and X'22 =−7.4 cm−1. Apparent photodissociation cross sections ranged from ∼1×10−20–1.6×10−19 cm2 in the visible spectrum. In the UV spectrum the highly congested vibrational structure could not be resolved sufficiently for analysis; photodissociation cross sections ranged from ∼2–4×10−19 cm2 with broad bands roughly corresponding to expected progression in ν1 and ν'2 within the C˜ 2B1←X˜ 2A1 electronic transition. The process SO+2 +hν→S++O2 showed an onset near 3108 A(ring) and the corresponding photodissociation spectrum showed sufficient vibrational structure to yield ν˜''2∼454 cm−1, ν˜'1 ∼955 cm−1, and ν˜2 ∼411 cm−1. This new process, which had σ≤3×10−20 cm2, was proposed to result from the D˜ 2B2←X˜ 2A1 transition. Several new photodissociation cross section measurements on N2O+ have also been made in the vicinities of 3381 and 4880 A(ring), taking advantage of the high sensitivity (→10−21 cm2) of the triple quadrupole system.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.450514
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