Hi Daniel,
On Mon, Sep 28, 2020 at 2:15 PM Daniel Przyrembel <
daniel.przyrem...@fu-berlin.de> wrote:
> Hi Matt,
>
> Well, independent of what Krause et al. have done, the correct uncertainty
> relation between core-hole widths as FWHM (full width at half maximum) and
> the lifetime is
>
> life
Hi Matt,
Well, independent of what Krause et al. have done, the correct uncertainty
relation between core-hole widths as FWHM (full width at half maximum) and
the lifetime is
lifetime = h_bar / FWHM
from the corresponding half-width (HWHM) expression
HWHM x lifetime >= h_bar / 2
Again, I just
Okay, there might be the issue:
h ~= 4.136e-15 eV s
h_bar ~= 6.582e-16 eV s
So if actually h is used instead of h_bar, then that gives the lifetimes
2*pi ~= 10 times too long!
I did not consider it could be due to that... But it apparently is.
> I believe it is using (or intends to use)
>
>
Hi,
Ah, Krause et al *do* use hbar, not h, so yeah With gamma = 0.2 eV, and h
~= 4.13567e-15 eVs (hbar ~ 6.582e-16 eVs), then lifetime is ~3 fs.
That is probably the mistake that hephaestus is making too. FWIW, we are
not currently, but could be reporting core-level widths and lifetimes at
https
I believe it is using (or intends to use)
lifetime = hbar /gamma
which is what Krause et al give. With gamma = 0.2 eV, and hbar ~=
4.13567e-15 eVs, then lifetime is ~20fs.
Maybe I'm missing something more subtle? FWIW, these reported numbers for
gamma in eV are described by Krause et al as
Hi Matt,
Thanks for the quick reply!
However, I seem to not have made clear my concern...
The widths in energy (eV) are fine.
However, in "Hephaestus", the "souped-up periodic table for the X-ray
absorption spectroscopist", these level widths in energy (eV) are also
given as equivalent lifetimes
Hi Daniel,
Thanks - that does seem wrong. FWIW, Larch uses XrayDB which uses corehole
widths from Krause and Oliver for Z>10 and Keski-Rahkoken nand Krause for
Z<10.
For the F K edge, this give 0.2089 eV. For this or other core-hole widths,
and assuming you have Python installed, try:
~> pip
To Whom it may concern,
I am quite sure there is a general lifetime/energy-width conversion error
in Hephaestus: All core-hole lifetimes seem to come out too long by a
factor of - as it seems exactly - 10:
E.g. the lifetime of the F K-edge with a width of 0.25 eV is given as
25.30 fs instead of ca
