This work is supported by the National Key Basic Program of China (No.2010CB922900) and the National Natural Science Foundation of China (No.91021008, No.i1274196, and No.iiiii120061).
A new 2-D variational method is proposed to calculate the vibrational energy levels of the symmetric P-H stretching vibration (vl) and the symmetric umbrella vibration (inversion vibration) (v2) of PH3^+(^~X...