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 (in fs), however incorrectly: A level width
of ~0.2 eV in fact corresponds to a lifetime of ca. 3 fs, not ~30 fs as
given there.
Those lifetimes shown in Hephaestus all seem to be off by a general factor
of 10. I guess that is just the energy width/lifetime conversion gone
slightly wrong...
I imagine I'm not the only one using Hephaestus as a convenient tool to
look stuff up quickly, so I thought it might be useful to point out this
flaw.
Just to make sure, I have again imported the xraydb: That has not changed
Hephaestus' behavior in terms of the lifetime info (I'm using the latest
64-bit version on Windows).
> 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 install xraydb
> ~> python
> >>> import xraydb
> >>> xraydb.core_width('F', 'K')
> 0.2089
>
> Or install Larch and use
>
> ~> larch
> larch> core_width('F', 'K')
> 0.2089
>
>
>
> On Mon, Sep 28, 2020 at 12:08 PM Daniel Przyrembel <
> daniel.przyrembel@fu-berlin.de> wrote:
>
>> 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. 2.6 fs (width = h_bar / lifetime).
>>
>> This glitch was present in 0.9.25 already and, as I noticed after
>> updating, prevails in 0.9.26. I have not tried earlier versions.
>>
>> Best regards,
>>
>> Daniel
>>
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