2022-06-07 05:53:48 +03:00
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"""
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Constants and unit conversion, mostly for standalode usage.
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Previously, QPMS used scipy.constants in the python parts.
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Now the relevant ones are set explicitly here in order
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to avoid dependency on the whole scipy (which needs a fortran
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compiler to build.
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The values are taken from scipy / "2018 CODATA recommended values".
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They slightly differ from the constants in GSL that are used
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in the C code. It would be desirable to use the same source,
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hence the values here might be subject to change in future versions.
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"""
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epsilon_0 = ε_0 = 8.8541878128e-12 # ± 0.0000000013e-12 F m^-1
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c = speed_of_light = 299792458.
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eV = e = elementary_charge = 1.602176487e-19 # ± 0000000040e-19 C
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hbar = ℏ = 1.054571800e-34 # ± 0.000000013e-34 J s
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mu_0 = μ_0 = 1.25663706212e-6 # ± 0.00000000019 e-6 N A^-2
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from math import pi
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π = pi
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2018-12-25 22:15:23 +02:00
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μm = 1e-6
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nm = 1e-9
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# "SCUFF FREQUENCY UNIT"
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SU = 3e14
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SCUFF_OMEGAUNIT = SU
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#freqs = freqs_weirdunits * c / μm
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def nm2eV(lambda_nm, n = 1):
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return 2*π*c/(n * lambda_nm * nm) / (eV / ℏ)
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def eV2nm(e_eV, n = 1):
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return 2*π*c/(n * e_eV * (eV/ℏ)) / nm
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def SU2eV(e_SU):
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'''
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Scuff frequency units to eV.
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'''
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return e_SU * SU / (eV / ℏ)
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def eV2SU(e_eV):
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return e_eV * (eV / ℏ) / SU
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def SU2nm(e_SU, n = 1):
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return 2*π*c/(n * e_SU * SU) / nm
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def nm2SU(lambda_nm, n = 1):
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return 2*π*c/(n * lambda_nm * nm) / SU
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