Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5428441 | Journal of Quantitative Spectroscopy and Radiative Transfer | 2014 | 12 Pages |
â¢Measured unknown broadening and shifts rates for the alkali D1 and D2 transitions.â¢Provided a comparison between the broadening cross-sections for all alkali.â¢Improved the fidelity of the measurement of the broadening and shift rates.â¢Revealed possible discrepancies on rates associated with the potassium transitions.
The pressure broadening and shift rates for the K D2 (4P3/22â4S1/22) transition with N2, CH4, C2H6, C3H8, n-C4H10, and the noble gases were obtained for pressures up to 80 Torr and at a temperature of 55 °C by means of laser absorption spectroscopy. Additionally, the broadening and shift rates for the Rb D1 (5P1/22â5S1/22) transition for He, CH4, C2H6, C3H8, and n-C4H10 were obtained using the same techniques and under similar conditions. The K D2 collisional broadening rate, γL, for He, Ne, Ar, Kr, Xe, N2, CH4, C2H6, C3H8, and n-C4H10 are 19.84, 8.88, 18.65, 19.17, 22.19, 18.98, 27.78, 27.60, 27.70, and 33.48 MHz/Torr, respectively. The uncertainty in the broadening rates is typically less than 2.1%. The corresponding pressure induced shift rates, δ, are 0.52, â2.06, â5.52, â5.42, â7.01, â5.66, â8.38, â8.04, â9.22, and â9.37 MHz/Torr with an uncertainty of less than 1.8%. The Rb D1 collisional broadening rates for He, CH4, C2H6, C3H8, and n-C4H10 are 20.80, 32.78, 30.49, 33.05, and 29.61 with uncertainties typically less than 2.2%. The collisional shift rates for the Rb D1 transition are 5.80, â6.96, â7.88, â8.61, and â9.43 with uncertainties on the order of 1.1%. A comparison with the other alkali broadening and shift cross-sections is presented.