heed++/code/PhysicalConstants.h

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#ifndef MYPHYSICALCONSTANTS_H
#define MYPHYSICALCONSTANTS_H
/*
Here I gathered constants appropriate for internal simulations of heed++.
These constants related to internal system of units traditionally
used in this field and applied in the old versions of HEED.
The old names are preserved.
2003, I. Smirnov.
*/
 
namespace Heed {
 
const double ELMAS = 0.51099906;             // Electron mass (MeV)
const double FSCON = 137.0359895;            // The fine ctructure constant
const double ELRAD = 1.0 / (FSCON * ELMAS);  // Electron radius (1/MeV)
const double ELRADCM = 2.81794092e-13;       // Electron radius (cm)
const double C1_MEV_CM = ELRAD / ELRADCM;    // Ratio r(1/MeV)/r(cm)
// or coefficient for passing from x(cm) to x(1/MeV) = 5.07E10
const double C1_MEV2_BN = C1_MEV_CM * C1_MEV_CM / 1.0e24;
// coefficient for passing from x(bn) to x(1/MeV^2) =
// (5.07E10)^2/(1.0e24)
const double C1_MEV2_MBN = C1_MEV_CM * C1_MEV_CM / 1.0e18;
// coefficient for passing from x(mbn) to x(1/MeV^2) =
// (5.07E10)^2/(1.0e18)
 
const double AVOGADRO = 6.0221367e23;
const double PLANK = 6.6260755e-34;      // Plank constant (J*sec)
const double ELCHARGE = 1.60217733e-19;  // Electron charge (C)
const double CLIGHT = 2.99792458e10;     // Light vel.(cm/sec)
const double PLANKCLIGHT = 197.327e-13;  // crossed plank * CLIGHT (Mev* cm)
                                         // Notes for memory:
// Crossed plank is plank divided by 2pi.
// The length of wave vector k in vacuum in units 1/[length]
// (that is 1/cm in this system)
// is the energy divided by PLANKCLIGHT
 
}
 
#endif