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*DECK XDRCST
FUNCTION XDRCST(CSTNAM,CSTUNT)
*
*-----------------------------------------------------------------------
*
*Purpose:
* To return the physical constants in the required units or get constant
* for converting between units.
*
*Copyright:
* Copyright (C) 2004 Ecole Polytechnique de Montreal
*
*Author(s): G. Marleau.
*
*Parameters: input
* CSTNAM constant name or initial units for conversion where
* \begin{itemize}
* \item \moc{CSTNAM}=\moc{Avogadro} is for Avogadro number
* with units in N/moles;
* \item \moc{CSTNAM}=\moc{Plank} is for Plank constant
* with units in J$\times$s, MeV$\times$s or eV$\times$s;
* \item \moc{CSTNAM}=\moc{Boltzmann} is for Boltzmann constant
* with units in J/K, MeV/K or eV/K ;
* \item \moc{CSTNAM}=\moc{Neutron mass} is for neutron mass
* with units in kg, amu, MeV or eV;
* \item \moc{CSTNAM}=\moc{Proton mass} is for proton mass
* with units in kg, amu, MeV or eV;
* \item \moc{CSTNAM}=\moc{kg} is the factor to transform kg
* into amu, MeV, eV or J;
* \item \moc{CSTNAM}=\moc{amu} is the factor to transform amu
* into kg, MeV, eV or J;
* \item \moc{CSTNAM}=\moc{eV} is the factor to transform eV
* into J or K;
* \item \moc{CSTNAM}=\moc{K} is the factor to transform K
* into J or eV;
* \item \moc{CSTNAM}=\moc{J} is the factor to transform J
* into eV or K;
* \item \moc{CSTNAM}=\moc{Pi} is for $\pi$
* without units.
* \end{itemize}
* CSTUNT units for the constant or final units as described for
* \moc{CSTNAM}.
*
*Parameters: input
* XDRCST numerical value of the constant in required unit.
*
*References:
* Peter J. Mohr and Barry N. Taylor, CODATA Recommended Values of the
* Fundamental Physical Constants: 2002. (to be published)
* http://physics.nist.gov/constants
* Last visit: September 04, 2004
*
*-----------------------------------------------------------------------
*
IMPLICIT NONE
*----
* Subroutine arguments
*----
CHARACTER CSTNAM*(*)
CHARACTER CSTUNT*(*)
DOUBLE PRECISION XDRCST
*----
* Parameters
*----
INTEGER IOUT
PARAMETER (IOUT=6)
CHARACTER NAMSBR*6
PARAMETER (NAMSBR='XDRCST')
DOUBLE PRECISION EVJOULE,AMUKG,SPEEDL
PARAMETER (EVJOULE=1.60217653D-19,AMUKG=1.66053886D-27,
> SPEEDL=2.99792458D+08)
DOUBLE PRECISION PI
PARAMETER (PI=3.14159265358979323846D+00)
CHARACTER CSTNT*12
CHARACTER CSTUT*12
*----
* Various constants
*----
XDRCST=0.0D0
CSTNT=CSTNAM
CSTUT=CSTUNT
IF(INDEX(CSTNT,'Avogadro') .NE. 0) THEN
XDRCST=6.0221415D+23
IF(INDEX(CSTUT,'N/moles') .EQ. 0) THEN
CALL XABORT(NAMSBR//': Invalid units for Avogadro number')
ENDIF
ELSE IF(INDEX(CSTNT,'Plank') .NE. 0) THEN
XDRCST=6.6260693D-34
IF(INDEX(CSTUT,'MeV s') .NE. 0) THEN
XDRCST=1.0D-06*XDRCST/EVJOULE
ELSE IF(INDEX(CSTUT,'eV s') .NE. 0) THEN
XDRCST=XDRCST/EVJOULE
ELSE IF(INDEX(CSTUT,'J s') .EQ. 0) THEN
CALL XABORT(NAMSBR//': Invalid units for Plank constant')
ENDIF
ELSE IF(INDEX(CSTNT,'Boltzmann') .NE. 0) THEN
XDRCST=1.3806505D-23
IF(INDEX(CSTUT,'MeV/K') .NE. 0) THEN
XDRCST=1.0D-06*XDRCST/EVJOULE
ELSE IF(INDEX(CSTUT,'eV/K') .NE. 0) THEN
XDRCST=XDRCST/EVJOULE
ELSE IF(INDEX(CSTUT,'J/K') .EQ. 0) THEN
CALL XABORT(NAMSBR//': Invalid units for Boltzmann constant')
ENDIF
*----
* Various mass
*----
ELSE IF(INDEX(CSTNT,'Neutron mass') .NE. 0) THEN
XDRCST=1.67492728D-27
IF(INDEX(CSTUT,'amu') .NE. 0) THEN
XDRCST=XDRCST/AMUKG
ELSE IF(INDEX(CSTUT,'MeV') .NE. 0) THEN
XDRCST=1.0D-06*XDRCST*SPEEDL*SPEEDL/EVJOULE
ELSE IF(INDEX(CSTUT,'eV') .NE. 0) THEN
XDRCST=XDRCST*SPEEDL*SPEEDL/EVJOULE
ELSE IF(INDEX(CSTUT,'kg') .EQ. 0) THEN
CALL XABORT(NAMSBR//': Invalid units for neutron mass')
ENDIF
ELSE IF(INDEX(CSTNT,'Proton mass') .NE. 0) THEN
XDRCST=1.67262171D-27
IF(INDEX(CSTUT,'amu') .NE. 0) THEN
XDRCST=XDRCST/AMUKG
ELSE IF(INDEX(CSTUT,'MeV') .NE. 0) THEN
XDRCST=1.0D-06*XDRCST*SPEEDL*SPEEDL/EVJOULE
ELSE IF(INDEX(CSTUT,'eV') .NE. 0) THEN
XDRCST=XDRCST*SPEEDL*SPEEDL/EVJOULE
ELSE IF(INDEX(CSTUT,'kg') .EQ. 0) THEN
CALL XABORT(NAMSBR//': Invalid units for neutron mass')
ENDIF
*----
* Various mass energy conversion units
*----
ELSE IF(INDEX(CSTNT,'kg') .NE. 0) THEN
IF(INDEX(CSTUT,'amu') .NE. 0) THEN
XDRCST=1.0D0/AMUKG
ELSE IF(INDEX(CSTUT,'MeV') .NE. 0) THEN
XDRCST=1.0D-06*SPEEDL*SPEEDL/EVJOULE
ELSE IF(INDEX(CSTUT,'eV') .NE. 0) THEN
XDRCST=SPEEDL*SPEEDL/EVJOULE
ELSE IF(INDEX(CSTUT,'J') .NE. 0) THEN
XDRCST=SPEEDL*SPEEDL
ELSE
CALL XABORT(NAMSBR//': No relations between '//CSTNT//
> ' and '//CSTUT)
ENDIF
ELSE IF(INDEX(CSTNT,'amu') .NE. 0) THEN
IF(INDEX(CSTUT,'kg') .NE. 0) THEN
XDRCST=AMUKG
ELSE IF(INDEX(CSTUT,'MeV') .NE. 0) THEN
XDRCST=1.0D-06*AMUKG*SPEEDL*SPEEDL/EVJOULE
ELSE IF(INDEX(CSTUT,'eV') .NE. 0) THEN
XDRCST=AMUKG*SPEEDL*SPEEDL/EVJOULE
ELSE IF(INDEX(CSTUT,'J') .NE. 0) THEN
XDRCST=AMUKG*SPEEDL*SPEEDL
ELSE
CALL XABORT(NAMSBR//': No relations between '//CSTNT//
> ' and '//CSTUT)
ENDIF
ELSE IF(INDEX(CSTNT,'eV') .NE. 0) THEN
IF(INDEX(CSTUT,'J') .NE. 0) THEN
XDRCST=EVJOULE
ELSE IF(INDEX(CSTUT,'K') .NE. 0) THEN
XDRCST=EVJOULE/1.3806505D-23
ELSE
CALL XABORT(NAMSBR//': No relations between '//CSTNT//
> ' and '//CSTUT)
ENDIF
ELSE IF(INDEX(CSTNT,'K') .NE. 0) THEN
IF(INDEX(CSTUT,'J') .NE. 0) THEN
XDRCST=1.3806505D-23
ELSE IF(INDEX(CSTUT,'eV') .NE. 0) THEN
XDRCST=1.3806505D-23/EVJOULE
ELSE
CALL XABORT(NAMSBR//': No relations between '//CSTNT//
> ' and '//CSTUT)
ENDIF
ELSE IF(INDEX(CSTNT,'J') .NE. 0) THEN
IF(INDEX(CSTUT,'eV') .NE. 0) THEN
XDRCST=1.0D0/EVJOULE
ELSE IF(INDEX(CSTUT,'K') .NE. 0) THEN
XDRCST=1.0D0/1.3806505D-23
ELSE
CALL XABORT(NAMSBR//': No relations between '//CSTNT//
> ' and '//CSTUT)
ENDIF
ELSE IF(INDEX(CSTNT,'Pi') .NE. 0) THEN
IF(CSTUT .EQ. ' ') THEN
XDRCST=PI
ELSE
CALL XABORT(NAMSBR//': No units for Pi ')
ENDIF
ELSE
CALL XABORT(NAMSBR//': '//CSTNT//
> ' is an invalid constant or unit')
ENDIF
RETURN
END
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