PLASMAKIN Manual
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pkIsPhotoElec

Name

pkIsPhotoElec -- Tests if a photon causes photoelectric emission from a given surface

Description

The function pkIsPhotoElec is used to test if a given photon induces photoelectron emission from a given surface. Additionally it also returns the index of the parent species. The main use of this function is in computing the photoelectron emission from the volume distribution of excited species.

Syntax

pkIsPhotoElec( PhotN, Surf, NParent, KParent )

NameDescriptionData type and attributes
PhotNPhoton indexINTEGER(IN)
SurfSurface nameCHARACTER(len=*), INTENT(IN)
NParentIndex of parent speciesINTEGER, INTENT(OUT)
KParentIndex of photoelectric emission reactionINTEGER, INTENT(OUT)

Results

The function returns a LOGICAL value.

Using a name to identify the surface allows one to compute the photoelectron emission from selected surfaces only and use different values of the photoelectron emission coefficient for different surfaces.

Examples

Example E-12. pkIsPhotoElec: Computing the photoelectron emission in a 1D discharge model.

In this example the matrix MPhot represents the probability of transmission of radiation from a plane i, perpendicular to the surface, to a surface "slice" j:

  INTEGER      :: dx, NParent, KParent, iPh, i
  REAL(double) :: MPhot(Nxp,Nxp), PhotElectrons(Nxp), KYield
  ...
  PhotElectrons(:) = 0.d0
  DO iPh = 1, NPhot
    IF( pkIsPhotoElec( iPh, 'wall', NParent, KParent ) ) THEN
      CALL pkGetReacCoef( 'Value', KYield, KParent )
      DO i = 1, Nxp
        DO j = 1, Nxp
          dx = ABS(j-i)+1
          PhotElectrons(i) = PhotElectrons(i) + &
            KYield * Dens(j,NParent) * MPhot(i,dx)
        END DO
      END DO
    END IF
  END DO

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