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>>> Ca_plus = Atom('Ca+')
>>> Ca_plus('4S1/2').to('3D5/2').matrix_element.to('e a0').m
0.0012221264747753456

>>> from atomphys import Atom
>>> Rb = Atom('Rb')

Traceback (most recent call last):
  File "/home/evgeny/work/other_studies/programming_notes/atomic_physics_mgrau/src/atomphys/atomphys/atom.py", line 40, in __init__
    self.load(atom)
  File "/home/evgeny/work/other_studies/programming_notes/atomic_physics_mgrau/src/atomphys/atomphys/atom.py", line 92, in load
    with open(filename) as file:
FileNotFoundError: [Errno 2] No such file or directory: 'Rb'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "test.py", line 4, in <module>
    Rb = Atom('Rb', refresh_cache=True)
  File "/home/evgeny/work/other_studies/programming_notes/atomic_physics_mgrau/src/atomphys/atomphys/atom.py", line 42, in __init__
    self.load_nist(atom, refresh_cache)
  File "/home/evgeny/work/other_studies/programming_notes/atomic_physics_mgrau/src/atomphys/atomphys/atom.py", line 114, in load_nist
    self._load_states(nist.parse_states(nist.fetch_states(atom, refresh_cache)))
  File "/home/evgeny/work/other_studies/programming_notes/atomic_physics_mgrau/src/atomphys/atomphys/data/nist.py", line 55, in parse_states
    return [
  File "/home/evgeny/work/other_studies/programming_notes/atomic_physics_mgrau/src/atomphys/atomphys/data/nist.py", line 70, in <listcomp>
    if print_term(state["Term"], J=state["J"])
KeyError: 'Term'

    values = {
        "spectrum": atom,
        "units": 2,  # energy units {0: cm^-1, 1: eV, 2: Ry}
        "format": 3,  # format {0: HTML, 1: ASCII, 2: CSV, 3: TSV}
        "multiplet_ordered": 1,  # energy ordred
        "term_out": "on",  # output the term symbol string
        "conf_out": "on",  # output the configutation string
        "level_out": "on",  # output the energy level
        "unc_out": 1,  # uncertainty on energy # --- changed 0 to 1
        "j_out": "on",  # output the J level
        "g_out": "on",  # output the g-factor
        "lande_out": "on",  # output experimentally measured g-factor # changed from "off" to "on"
    }

https://physics.nist.gov/cgi-bin/ASD/energy1.pl?spectrum=rb+i&units=2&format=3&multiplet_ordered=1&term_out=on&conf_out=on&level_out=on&unc_out=0&j_out=on&g_out=on&lande_out=off

atom.Atom('H',refresh_cache=True)
     59     return [
     60         {
     61             **{
     62                 "energy": remove_annotations(state["Level (Ry)"]) + " Ry",
     63                 "term": print_term(state["Term"], J=state["J"]),
     64                 "configuration": state["Configuration"],
     65                 "g": None if state["g"] == "" else float(state["g"]),
     66             },
     67             **(
     68                 {"n": int(monovalent.match(state["Configuration"])["n"])}
     69                 if monovalent.match(state["Configuration"])
     70                 else {}
     71             ),
     72         }
     73 
     74         for state in data
---> 75         if print_term(state["Term"], J=state["J"])
     76     ]

KeyError: 'Term'