yuedeng
Hi,
I'm trying to find the Strain using the below macro. I know that the first part until 'prm = Voigt_FWHM_GL(CeV_or_0(sgc, sgv), CeV_or_0(slc, slv)) .25' is the definition of the e0.
However, the later part 'Pi/360' seems to be merely a unit transformation from degree to radian. But Pi=180, a factor of 2 is missing, is it something related to the 2 in the 2theta?
macro e0_from_Strain(e0, sgc, sgv, slc, slv)
{
#m_argu sgc
#m_argu slc
prm = Voigt_FWHM_GL(CeV_or_0(sgc, sgv), CeV_or_0(slc, slv)) .25 Pi/360; : e0
#m_ifarg sgv "" #m_else
Strain_G(sgc, sgv)
#m_endif
#m_ifarg slv "" #m_else
Strain_L(slc, slv)
#m_endif
}
rowlesmr
Yes.
The values sgv and slv have units of 2Th. The value of strain depends on Th, not 2Th, so there is an additional factor of 1/2.
e0 = Voigt_FWHM * (1/4) * ((Pi/180)/2)