High-resolution study of the b1Σ+(b0+)→X3Σ−(X10+) transition of PI

✍ Scribed by K.D. Setzer; M. Beutel; Ewald H. Fink

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 129 KB
• Volume: 221
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1016/s0022-2852(03)00166-8

✦ Synopsis

Emission spectra of the b

transition of phosphorus iodide have been measured with a high-resolution Fourier-transform spectrometer. The PI radicals were generated and excited in a fast-flow system by reaction of phosphorus vapor (P x ) with iodine and microwave-discharged oxygen. Four sequences,

transition of PI comprising 28 bands were observed. Six bands were measured at high spectral resolution. Vibrational and rotational analyses have yielded accurate spectroscopic constants of the X 1 0 þ and b0 þ states (in cm À1 ): X 1 0 þ : x e ¼ 371.296(4), x e x e ¼ 1.3302(9), B e ¼ 0.1194117(2), a B ¼ )0.0005676(7), D e ¼ 4.56(2) Â10 À8 ; b0 þ : T e ¼ 11136.921(4), x e ¼ 400.165(6), x e x e ¼ 1.345(2), B e ¼ 0.1239237(2), a B ¼ )0.0005540(2), D e ¼ 4.84(5) Â 10 À8 , where the numbers in parentheses are the standard deviations of the parameters. No emissions of the b0 þ ! X 2 1 sub-system nor of the a 1 Dða2Þ ! X 3 R À ðX 2 1Þ transition have been observed leaving PI the only group Va halide for which the spin splitting in the X 3 R À ground state is still unknown.