Collisional broadening and line intensities in the ν2 and ν4 bands of PH3

N2-broadening coefficients in the ν2 and ν4 bands of PH3

“…3 for the Q R (10, 5) and R P (6, 0) lines of PH 3 . The point closest to zero corresponds to the self-broadening contribution, which was systematically taken into account from the self-broadening coefficients previously obtained at 298 K [7] and the constant partial pressure of PH 3 in the gas mixtures. The slopes of the straight lines obtained from unconstrained linear least-squares procedures give the N 2 -broadening coefficients c 0 (cm À1 atm À1 ).…”

“…We have recently measured H 2 -broadening coefficients of PH 3 at room [5] and low temperatures [6] as well as self-broadenings [7] in the m 2 and m 4 bands. In this work, we measure the N 2 -broadening coefficients of 40 lines of PH 3 in the Q R branch of the m 2 band as well as 21 lines in the P P, R P, S P, and P Q branches of the m 4 band, using a tunable diode-laser spectrometer.…”

Helium- and argon-broadening coefficients of phosphine lines in the ν2 and ν4 bands

“…We have recently measured H 2 -broadening coefficients of PH 3 at room [10] and low temperature [11] as well as self-broadenings [12] in the m 2 and m 4 bands. In this work, we measure He-and Ar-broadening coefficients of 25 lines of PH 3 in the Q R branch of the m 2 band as well as 13 lines in the P P and R P branches of the m 4 band, using a tunable diode-laser spectrometer.…”

Hydrogen line broadening in the ν2 and ν4 bands of phosphine at low temperature

“…3 for the Q R(10,2) line of the m 2 band of PH 3 . The point closest to zero corresponds to the self-broadening contribution, which was systematically taken into account from the PH 3 -broadening coefficients previously obtained at 173.4 K [15] and the constant partial pressure of PH 3 in the gas mixtures. The slopes of the straight lines obtained from unconstrained linear leastsquares procedures give the H 2 -broadening coefficients c 0 (cm À1 atm À1 ).…”

“….) the states of PH 3 are degenerate (wavefunctions w + ,w À of A 1 and A 2 symmetry with the selection rule A 1 M A 2 ) leading to the middle term of the differential cross-section [8], S 2,f2i2 = 0 (instead of being negative) for dipolar transitions [15]. The calculation shows that the influence of this vanishing middle term strongly increases with increasing n, and the resulting c 0 values (in 10 À3 cm À1 atm À1 ) become too large: 146.3 instead of 102.4 for the Q R(6,6) line (observed 126.5) and 139 instead of 81.6 for the Q R(9,9) line (observed 105).…”