Describe is a GUIDE command that prints out detailed information
about either one or two energy levels and, if two levels are
input, any atomic transitions between them.
describe(Z, ion, level1, [level2])
`describe' lists the available atomic data about one or two
energy levels, as well as radiative and collisional
transitions between them. describe is a GUIDE routine, which
must be initialized using the require("guide") command in
chips or sherpa. GUIDE uses the optional ATOMDB database,
and this command will fail if the ATOMDB is not available on
your system. Energy levels begin at 1 for the ground state of the
ion. describe is frequently used after identifying a line
with the GUIDE identify command. There is also a GUIDE thread showing how to use GUIDE with grating data to
identify and describe emission lines.
sherpa> require("guide")
GUIDE Initialized using ATOMDB v1.3.0
sherpa> describe(8,7,1,7)
Ion O VII, energy level 1 ---
electron configuration : 1s^2~^1S_{0}
energy above ground (eV) : 0.000000
Quantum state : n=1, l=N/A, s=0, degeneracy=1
Energy level data source : 1983ADNDT..29..467S
Photoionization data source : 1986ADNDT..34..415C
-------------------------------------------
Ion O VII, energy level 7 ---
electron configuration : 1s2p~^1P_{1}
energy above ground (eV) : 574.187012
Quantum state : n=2, l=1, s=0, degeneracy=3
Energy level data source : 1983ADNDT..29..467S
Photoionization data source : 1986ADNDT..34..415C
-------------------------------------------
Ion O VII, 1 - 7 interactions ---
Electron collision rate from 1 -> 7 : nonzero.
Reference bibcode : 1989ADNDT..42..313K
Wavelength (lab/observed) (Angstrom) : 21.601503 +/- 0.007000
Wavelength (theory) (Angstrom) : 21.629999
Transition rate/Einstein A (s^-1) : 3.303330e+12
Wavelength (lab/observed) reference : 1988CaJPh..66..586D
Wavelength (theory) reference : 1983ADNDT..29..467S
Transition rate reference : 1987JPhB...20.6457F
Lists all information available in the APED about the O
VII resonance transition between the ground state and the
6th excited state. The references are given in the ADS
bibcode format, which is used by the NASA Astrophysics
Data System (ADS).
chips> require("guide")
GUIDE Initialized using ATOMDB v1.3.0
describe(26,17,10)
Ion Fe XVII, energy level 10 ---
electron configuration : 2s^22p^5(^2P)3p~^3P_{2}
energy above ground (eV) : 762.811462
Quantum state : n=3, l=1, s=N/A, degeneracy=5
Energy level data source : 1997UNPUB.Liedahl.L
Photoionization data source : 1986ADNDT..34..415C
Lists all information available in the APED about the Fe XVII
9th excited level. Since only one level is given, no
transition data is printed.
Parameter=Z (integer required filetype=input min=1 max=28)
The atomic number for the element of interest.
Parameter=Ion (integer required filetype=input min=1 max=28)
The ion number (starting at 1 for the neutral ion) for the
ion of interest.
The first energy level (starting at 1 for the ground state)
of interest.
The second energy level (starting at 1 for the ground state)
of interest. If present, transitions between the two levels
are printed, along with information about each level. The
order of the two energy levels is not significant.
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