Term |
Unit |
Description |
s |
1/Å |
resolution |
v |
keV |
accelerating voltage |
Cs |
mm |
spherical aberration |
Cc |
mm |
chromatic abbe ration |
Q |
|
amplitude contrast [0-1] |
dE |
eV |
time variation of electron beam energy from the average |
dI |
ppm |
time variation of object lens current from the average |
dF |
Å |
vertical sinusoidal motion amplitude |
dR |
Å |
horizontal drift amplitude |
dZ |
Å |
defocus, negative for under-focus |
B |
Å2 |
envelope decay parameter, exp(-B*s^2) |
a |
mrad |
illumination angle |
lambda(v) |
Å |
electron wavelength, automatically computed from voltage |
gamma(s,v,Cs,dZ) |
|
-2*pi*(2.5e6*Cs*lambda(v)^3*s^4+dZ*lambda(v)*s^2/2) |
ctf(s,v,Cs,dZ,Q) |
|
-(sqrt(1-Q*Q)*sin(gamma(s,v,Cs,dZ))+Q*cos(gamma(s,v,Cs,dZ))) |
Gsc(s,v,Cs,dZ,a) |
|
spatial coherence decay: exp(-(pi*a*(1.0e7*Cs*lambda(v)^2*s^3-dZ*s))^2/1e6) |
Gtc(s,v,Cc,dE) |
|
temporal energy spread decay: exp(-1.0e8*(pi*Cc*lambda(v)*s^2*dE/v)^2/(16*ln(2))) |
Gol(s,v,Cc,dE) |
|
temporal lens current spread decay: exp(-1.0e2*(pi*Cc*lambda(v)*s^2*dI)^2/(4*ln(2))) |
Glm(s,v,dF) |
|
vertical motion decay: j0(pi*dF*lambda(v)*s*s) |
Gtm(s,dR) |
|
horizontal drift decay: sinc(pi*s*dR) |
sinc(s) |
|
sinc function: sin(s)/s |
j0(s) |
|
Bessel function of the first kind, order 0: (57568490574.0+s*s*(-13362590354.0+s*s*(651619640.7+s*s*(-11214424.18+s*s*(77392.33017+s*s*(-184.9052456))))))
/(57568490411.0+s*s*(1029532 985.0+s*s*(9494680.718+s*s*(59272.64853+s*s*(267.8532712+s*s*1.0))))) |