Source code for EPWpy.utilities.constants

import numpy as np
import scipy.constants as sc
########Constants ##################
hbar = 6.582119569*10**-16   #in eV-S
q = 1.602*10**-19      #in Coulomb
c = 3.0*10**10      #in cm/s
CM2MEV = 0.1239841984 # https://physics.nist.gov/cgi-bin/cuu/Value?minvev
Bohr2Ang = 0.5291772108
Ryd2Hart = 0.5
Ang2Bohr = 1.0/Bohr2Ang



[docs]
class Constants:
    """
    Provides commonly used physical and atomic constants.

    All methods return a numerical value corresponding to the constant.
    """

    def __init__(self):
        """
        Initialize the Constants class.
        Currently, no dynamic attributes are needed.
        """
        pass



[docs]
    def ryd2hart(self):
        """Conversion factor from Rydberg to Hartree."""
        return 0.5





[docs]
    def hbar_eVs(self):
        """Reduced Planck constant in eV·s."""
        return 6.582119569e-16





[docs]
    def hbar_Js(self):
        """Reduced Planck constant in J·s."""
        return 1.054571817e-34





[docs]
    def eps0(self):
        """Vacuum permittivity (F/m)."""
        return 8.8541878188e-12





[docs]
    def mu0(self):
        """Vacuum permeability (H/m)."""
        return 1.25663706127e-6





[docs]
    def q(self):
        """Elementary charge (C)."""
        return 1.602176634e-19





[docs]
    def bohr2ang(self):
        """Bohr radius in Angstroms."""
        return 0.5291772108





[docs]
    def ang2bohr(self):
        """Angstrom to Bohr conversion."""
        return 1.0 / self.bohr2ang()





[docs]
    def cm2meV(self):
        """Conversion factor from cm⁻¹ to meV."""
        return 0.1239841984





[docs]
    def c_ms(self):
        """Speed of light in m/s."""
        return 299792458





[docs]
    def c_cms(self):
        """Speed of light in cm/s."""
        return 299792458 * 100





[docs]
    def thr4(self):
        """
        Return 1E-4
        """
        return 1E-4





[docs]
    def thr6(self):
        """
        Return 1E-6
        """
        return 1E-6





[docs]
    def thr8(self):
        """
        Return 1E-8
        """
        return 1E-8





[docs]
    def thr10(self):
        """
        Return 1E-10
        """
        return 1E-10





[docs]
    def thr12(self):
        """
        Return 1E-12
        """
        return 1E-12