#!/usr/bin/env python
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"""Constants in cgs units.
Attributes
----------
AVOGADRO_NUMBER : float
Avagadro constant [1/mol]
BOLTZMANN_CONSTANT : float
Boltzmann constant [erg/k]
CLASSICAL_ELECTRON_RADIUS : float
Classical electron radius [cm]
ELECTRONIC_CHARGE : float
Electronic charge [esu]
ELECTRON_VOLT : float
Electron volt (keV) [erg]
ELECTRON_MASS : float
Electron mass [g]
FINE_STRUCTURE_CONSTANT : float
Fine structure constant
PLANCK_CONSTANT : float
Reduced planck's constant [keV*s]
PROTON_MASS : float
Proton mass [g]
SPEED_OF_LIGHT : float
Speed of light in vacuum [cm/s]
THOMPSON_CROSS_SECTION : float
Thomson cross section [cm^2]
PI : float
Ratio of a circle's circumference to its diameter
"""
AVOGADRO_NUMBER = 6.02214129e+23
BOLTZMANN_CONSTANT = 1.3806488e-16
CLASSICAL_ELECTRON_RADIUS = 2.8179402894e-13
ELECTRONIC_CHARGE = 4.80320425e-10
ELECTRON_VOLT = 1.602176565e-9
ELECTRON_MASS = 9.10938188e-28
FINE_STRUCTURE_CONSTANT = 7.2973525698e-3
PLANCK_CONSTANT = 6.58211928e-19
PROTON_MASS = 1.67261777e-24
SPEED_OF_LIGHT = 299792458e+2
THOMPSON_CROSS_SECTION = 6.652458734e-25
PI = 3.14159265359
RADIUS = 10
DEFAULT_ENERGY = 15.0
[docs]def wavelength(energy):
"""Return wavelength [cm] of light given energy [keV]."""
return 2 * PI * PLANCK_CONSTANT * SPEED_OF_LIGHT / energy