The j and k dependencies of the line coupling and line mixing effects: Theoretical studies of the relaxation matrices of N2-broadened CH3D

The influence of line mixing on the j and k dependencies of halfwidths and temperature exponents in N2-broadening coefficients of CH3F spectral lines

“…Except for the CH 3 D-N 2 system whose dominant component of potential is L 1 = 3 [6] , these reduction behaviors were already observed in the NH 3 -NH 3 [ 19,22 ], PH 3 -PH 3 [24] , and CH 3 I-N 2 [8] systems. One can easily understood them by analyzing the amplitudes of the off-diagonal elements of S 2,middle which is the origin of both LC and LM.…”

“…Generally, incorporating LC leads to smaller calculated halfwidths (i.e., the diagonal elements of W) than those obtained from MRB. Moreover, after evaluating the resolvent operator and considering LM, the calculated "effective" halfwidths may be reduced further, as demonstrated in our recent studies of N 2 -broadening of CH 3 X species [6][7][8] . Specifically, for symmetric-tops with k-degeneracy, following Cherkasov [15] , transitions between rotational states should be treated as doublets, with each doublet's components possibly coupled by the LM process.…”

“…Recently, CH 3 F has been included for the first time to the HITRAN and GEISA databases [1] . Therefore, after completing our studies of CH 3 Cl [7] , CH 3 I [8] , and CH 3 D [6] , our next focus is on CH 3 F, a minor atmospheric pollutant that is known for its involvement in fundamental chemical reactions that occur in the Earth's atmosphere [ 9 and references therein]. Due to its strong warming potential and significant long lifetime in the atmosphere, its atmospheric concentration must be controlled.…”