First ionization potential¶
- class PyAstronomy.pyasl.FirstIonizationPot¶
First ionization potentials of individual elements.
The data have been obtained from NIST: http://physics.nist.gov/PhysRefData/ASD/ionEnergy.html
Methods
getFIP(atom)Get the first ionization energy.
- getFIP(atom)¶
Get the first ionization energy.
- Parameters
- atomstring or integer
Either a string specifying the elemental symbol (e.g., ‘H’) or an integer specifying the atomic number.
- Returns
- FIPfloat
First ionization potential [eV].
- FIP errorfloat
Error of the FIP [eV]. May also be None if no error is available.
- PyAstronomy.pyasl.plotFIP()¶
Show a plot of first ionization energy vs. atomic number.
Example¶
from __future__ import print_function, division
from PyAstronomy import pyasl
fip = pyasl.FirstIonizationPot()
print("First ionization energy of Li = %4.2e +/- %4.2e eV" % fip.getFIP(3))
print("First ionization energy of Protactinium = %4.2e +/- %4.2e eV" % fip.getFIP(91))
# And the same using elemental symbols
print()
print("First ionization energy of Li = %4.2e +/- %4.2e eV" % fip.getFIP("Li"))
print("First ionization energy of Protactinium = %4.2e +/- %4.2e eV" % fip.getFIP("Pa"))
# Plot the first ionization energy as a function of atomic number
pyasl.plotFIP()
