15min:

L. R. BROWN, R. A. TOTH, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109-8099; V. MALATHY DEVI, D. CHRIS BENNER, Department of Physics, The College of William and Mary, Williamsburg, VA 23187-8795; M. A. H. SMITH, Science Directorate, NASA Langley Research Center, MS 401A, Hampton, VA 23681-2199.

Line mixing has been measured for two pairs of transitions in the ₂ band of water. The rotational assignments of the four lines (in terms of the rotational quantum numbers J, K_a and K_c) are a) two P branch lines: (1 0 1) (2 1 2) mixing with (2 1 2) (3 0 3) at 1539.061 and 1540.300 cm^-1, respectively; and b) two R branch lines: (3 0 3) (2 1 2) mixing with (2 1 2) (1 0 1) at 1652.400 and 1653.267 cm^-1, respectively. Pressure broadening coefficients of H₂O (halfwidths, pressure shifts and off-diagonal relaxation matrix elements) are reported for seven broadeners (self, H₂, He, CO₂, N₂, O₂ and air) obtained from retrievals performed by multispectrum fitting implemented with line mixing.