Spectroscopic data base for the methylene ion (CH2+) and parsing programs

The present data set is for CH2+ ion and includes 5 files. Energy levels, a list of transitions, and a JSON data base file are available. Two parsing Python scripts are available as well. Energy levels The energy levels of the CH2+ ion can be found in the ASCII file named levels.txt containing 11 columns. Columns 1—3 are the usual rotational quantum numbers N, Ka, Kc Column 4 is the quantum number F for the total angular momentum F=N+S Columns 5—7 are the three vibrational quantum numbers (v1, v2, v3) Column 8 is vx which is 0 and 1 for the lower X+ and the upper A+ Renner-Teller electronic sub-states, respectively Column 9 is sym the C2v symmetry of the level Column 10 is the energy in cm−1 Column 11 if the nuclear spin statistical weight of the level. Levels are listed up to N=11 and 4500 cm−1 Transitions Electric dipole transitions of the CH2+ ion can be found in the ASCII file named trns.txt containing 24 columns. Columns 1—9 give the upper level assignment using as for the previous table: N, Ka, Kc, F, (v1, v2, v3), vx, and sym Column 10—18 give the lower level assignment using also N, Ka, Kc, F, (v1, v2, v3), vx, and sym Column 19 gives sig the transitions wavenumber in cm−1 Column 20 is eup the energy of the upper level in cm−1 Column 21 is elw the energy of the lower level in cm−1 Column 22 is stren the line strength in Debye2 Column 23 is a12 the Einstein coefficient in s—1 Column 24 is g the nuclear spin statistical weight Transitions are sorted with increasing wavenumber. JSON data base file and Python scripts A JSON data base file containing both the energy levels and the transition is given the file named dtb.json. This file should be parsed using the Python scripts described bellow: The Python script file parse_levels_json.py should be used to extract the information concerning levels from the JSON data base file. The Python script file parse_transitions_json.py should be use to extract the information concerning transitions from the JSON data base file.