; file: constants_si.idl = assign values of constants in S units
; init: Jan 14 2012 
; note: derived from Uitenbroek RH file constants.h ; corrected

; --- Mathematical constants 
 PI          = 3.14159265358979
 SQRTPI      = 1.77245385090551
 TWOSQRTTWO  = 0.35355339059327    ;  1/(2sqrt(2))

; --- Unit conversions 
 AA_TO_M         = 1.0E-10
 NM_TO_M         = 1.0E-09
 CM_TO_M         = 1.0E-02
 KM_TO_M         = 1.0E+03
 ERG_TO_JOULE    = 1.0E-07
 G_TO_KG         = 1.0E-03
 MICRON_TO_NM    = 1.0E+03
 MEGABARN_TO_M2  = 1.0E-22
 ATM_TO_PA       = 1.0135E+05      ; Atm to Pascal (N/m^2)     

; --- Physics constants in SI (m, Joule, etc)
 CLIGHT      = 2.99792458E+08      ; Speed of light [m/s]      
 HPLANCK     = 6.626068E-34        ; Planck's constant [Js]    
 KBOLTZMANN  = 1.380650E-23        ; Boltzman's constant [J/K] 
 AMU         = 1.6605402E-27       ; Atomic mass unit [kg]     
 M_ELECTRON  = 9.1093897E-31       ; Electron mass [kg]        
 Q_ELECTRON  = 1.60217733E-19      ; Electron charge [C]       
 EPSILON_0   = 8.854187817E-12     ; Vacuum permittivity [F/m] 
 MU_0        = 1.2566370614E-06    ; Magnetic induct. of vac.  
 RBOHR       = 5.29177349E-11      ; Bohr radius [m]           
 E_RYDBERG   = 2.1798741E-18       ; Ion. pot. Hydrogen [J]    
 EV          = 1.60217733E-19      ; One electronVolt [J]      
 THETA0      = 5.03974756E+03      ; log10(e) * eV/k [K^-1]    
 ABARH       = 7.42E-41            ; polarizabilty of Hydrogen in [Fm^2]
 LARMOR      = (Q_ELECTRON/(4.0*PI*M_ELECTRON))*NM_TO_M ; Larmor radius
 E_ION_HMIN  = 0.754 * EV          ; Ionization energy Hmin in [J] 



