Function adas.transition_index

Return the index in lower and upper list corresponding to a requested set of transitions.

Parameters

lower : int, array

lower level index

upper : int, array

upper level index

req_lower : int, optional array

lower level for which index is required

req_upper : int, optional array

upper level for which index is required

Returns

itran : int, may be an array

index of requested transition in lower and upper arrays.

Notes

An index of -1 is returned if there is no match or if there is more than one match. The value should be checked before using to extract values from an array.

upper and lower lists follow ADAS convention of starting at 1 but the returned index follows python convention of starting at 0.

Version History

• Martin O'Mullane, 24-01-2024

  • First version

• Martin O'Mullane, 27-02-2024

  • If only one transition is requested return an integer and not a 1 element array.

Examples

Find the A-values of the 2s 2p 1P (transition 5-1) and 2s 3p 1P transition 11-1) in Li+.

>>> import adas as adas
>>> import numpy as np
>>> file='/home/adas/adas/adf04/adas#3/cpb02_ls#li1.dat'
>>> fd=adas.xxdata_04(file)
>>> index=adas.transition_index(fd['lower'], fd['upper'], [1, 1], [5, 11])
>>> print(index)
[3 9]
>>> print(fd['aval'][index])
[2.65e+10 8.57e+09]