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Title: High resolution FTIR spectrum of the ν5 and 2ν9 bands of HNO3
Authors: Tan, T.L. 
Looi, E.C.
Lua, K.T.
Issue Date: Jul-1992
Source: Tan, T.L.,Looi, E.C.,Lua, K.T. (1992-07). High resolution FTIR spectrum of the ν5 and 2ν9 bands of HNO3. Spectrochimica Acta Part A: Molecular Spectroscopy 48 (7) : 975-981. ScholarBank@NUS Repository.
Abstract: The Fourier transform infrared (FTIR) spectrum of the ν5 and 2ν9 bands of nitric acid (HNO3) has been measured with a resolution of 0.004 cm-1 in the frequency range of 856-910 cm-1. By fitting a total of 744 unperturbed transitions of ν5 with a standard deviation (SD) of 0.00051 cm-1, using a Watson Hamiltonian, a set of nine improved rovibrational constants for the upper state was obtained. Some transitions of 2ν9 were perturbed by a Femi resonance with the nearby ν5 state. A total of 280 unperturbed transitions of 2ν9 have been analyzed to provide nine rovibrational constants for the υ9 = 2 state with a SD of 0.00058 cm-1. The ν5 and 2ν9 bands are mainly A-type with band centres at 879.108200 ± 0.000045 and 896.44881 ± 0.00011 cm-1, respectively. A comparison of calculated line intensities of ν5 with measured values gives the transition moment as 0.155 ± 0.031 D and the integrated band intensity as 282 ± 56 cm-2 atm-1 (or 68 ± 14 km mol-1). The transition moment of the 2ν9 band is therefore estimated to be 0 17 ± 0.03 D which gives an integrated band intensity of 356 ± 71 cm-2 atm-1 (or 86 ± 17 km mol-1). © 1992.
Source Title: Spectrochimica Acta Part A: Molecular Spectroscopy
ISSN: 05848539
Appears in Collections:Staff Publications

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