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constants_m.f
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constants_m.f
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MODULE constants_m
integer , parameter :: ABOVE=+100000000
integer , parameter :: BELOW=-100000000
real*8 , parameter :: PI=3.141592653589793238462643383279502884197d0
real*8 , parameter :: PIO2=1.57079632679489661923132169163975144209858d0
real*8 , parameter :: TWOPI=6.283185307179586476925286766559005768394d0
real*8 , parameter :: FOURPI=12.56637061435917295385d0
real*8 , parameter :: PI4 = FOURPI
real*8 , parameter :: SQRT2=1.41421356237309504880168872420969807856967d0
real*8 , parameter :: SQRT2PI=2.50662827463100050242d0
real*8 , parameter :: EULER=0.5772156649015328606065120900824024310422d0
real*8 , parameter :: HALF = 5.d-1
real*8 , parameter :: THIRD = 1.d0/3.d0
real*8 , parameter :: TWO = 2.d0
real*8 , parameter :: THREE = 3.d0
real*8 , parameter :: FOUR = 4.d0
real*8 , parameter :: FIVE = 5.d0
real*8 , parameter :: SIX = 6.d0
real*8 , parameter :: TWELVE = 12.d0
real*8 , parameter :: ThreeQuarters= 3.d0/4.d0
real*8 , parameter :: a_Bohr = 0.52917720859d0
real*8 , parameter :: Hartree_2_eV = 27.21138386d0
real*8 , parameter :: h_bar = 6.58264d-4 ! <== Planck's constant (eV * ps)
real*8 , parameter :: debye_inv = 2.0819436d-1 ! <== e[C]*d[Angs] = p[Debye] * 0.20819436
real*8 , parameter :: debye_2_au = 0.393430294d0 ! <== converts Debye units to atomic units (a.u.)
real*8 , parameter :: low_prec = 1.d-7
real*8 , parameter :: mid_prec = 1.d-10
real*8 , parameter :: high_prec = 1.d-14
real*8 , parameter :: large = 1.d+6
real*8 , parameter :: real_large = 1.d+10
real*8 , parameter :: infty = 1.d+30
real*8 , parameter :: deg_2_rad = PI / 180.0d0
real*8 , parameter :: rad_2_deg = 180.0d0 / PI
real*8 , parameter :: cutoff_Angs = 12.d0 ! <== cutoff radius for overlap related calculations
complex*16 , parameter :: zi = (0.d0,1.d0)
complex*16 , parameter :: C_zero = (0.d0,0.d0)
real*8 , parameter :: D_zero = 0.d0
integer , parameter :: I_zero = 0
complex*16 , parameter :: C_one = (1.d0,0.d0)
complex*16 , parameter :: C_two = (2.d0,0.d0)
real*8 , parameter :: D_one = 1.d0
integer , parameter :: I_one = 1
logical , parameter :: YES = .true.
logical , parameter :: NO = .false.
logical , parameter :: OFF = .false.
! Molecular dynamics constants ...
real*8 , parameter :: ee = 1.60219d-19 ! in Coulomb
real*8 , parameter :: rsqpi = 0.56418958354d0 ! sqrt(pi)
real*8 , parameter :: mol = 6.02214129d26 ! mol X 1000
real*8 , parameter :: imol = 0.166057788d-26 ! 1/(mol x 1000)
real*8 , parameter :: boltz = 1.3806488d-23 ! kB in J/K
real*8 , parameter :: iboltz = 2.41432176d22 ! 1/(3kB) in K/J
real*8 , parameter :: coulomb = 230.7113d0 ! e^2/(4.pi.epsilon_0) x 1.E+20 N.m^2
real*8 , parameter :: kJmol_2_eV = 0.010364272301331d0 ! converts kJ/mol to eV units
real*8 , parameter :: Dalton_2_eV = 0.010364272301331d-2 ! converts mass: Dalton to eV*ps^2/Ang^2
real*8 , parameter :: eV_2_kJmol = 96.485307499258d0 ! converts eV to kJ/mol units
real*8 , parameter :: cal_2_J = 4.184d0 ! converts cal to J units
real*8 , parameter :: milli = 1.0d-3 ! milli unit
real*8 , parameter :: micro = 1.0d-6 ! micro unit
real*8 , parameter :: pico_2_sec = 1.0d-12 ! converts picosecond units to second units
real*8 , parameter :: nano_2_angs = 1.0d1 ! converts nanometer units to angstron units
real*8 , parameter :: mts_2_nano = 1.0d9 ! converts meter units to nanometer units
real*8 , parameter :: Angs_2_mts = 1.0d-10 ! converts Angs units to meter units
real*8 , parameter :: mts_2_Angs = 1.0d+10 ! converts meter units to Angs units
real*8 , parameter :: cm_2_Angs = 1.0d+8 ! converts centimeter units to Angs units
real*8 , parameter :: amber_LJ = 1.12246204830937d0 ! converts sigma LJ (amber) to OPLS
real*8 , parameter :: factor1 = 1.0d26 ! factor used to not work with small numbers
real*8 , parameter :: factor2 = 1.0d24 ! factor used to not work with small numbers
real*8 , parameter :: factor3 = 1.0d-20 ! factor used to compensate the factor1 and factor2 factors
END MODULE constants_m