Kai Fauth

10 Questions 839 Answers 0 Followers

Questions related from Kai Fauth

Does it make sense to ask for the duration of a light scattering event?

Suppose a photon with wavevector k is being elastically scattered from, say, an atom into a state with different wavevector q, does it make sense to ponder the (average) duration of such an...

11 December 2018 5,596 6 View

Does someone have a reliable estimate for the Fe 2p core hole lifetime from XPS or a related technique? (metallic Fe)

I am surprised to not easily find this information in the literature I consulted so far. My guess it that that the lifetime width will range somewhere around 250..500 meV and I'd like to know a...

28 March 2017 6,782 6 View

Literature concerning optical phonons in Laves phase compounds ?

We happen to have taken some Raman scattering in Ce-Pt and La-Pt surface intermetallic compounds. We find both vibronic and electronic excitations (see linked manuscript in case you're...

13 December 2016 4,774 1 View

How to check Kramers conjugation in practice?

Any state composed of an odd number of electrons is known to exhibit (at least) two-fold degeneracy (Kramers theorem, Kramers degeneracy). If I am not mistaken, Kramers conjugate pairs of states...

01 June 2016 8,283 6 View

How to adequately interpret "nonthermal" occupations of (crystal field) excited states in the (NCA treatment of the) Kondo impurity?

My question concerns the interpretation of occupation numbers in the Kondo problem in presence of crystal fields. (1) Consider first a Ce4f electron in a hexagonal crystal field (CF) without Kondo...

09 February 2016 7,761 1 View

Under which conditions is an asymmetric Raman tensor obtained in backscattering geometry?

In a review by Schaack I came across the notion that a possible signature of electronic Raman losses (as opposed to losses due to phonons) is the appearance of a non-symmetric Raman tensor. As far...

21 February 2015 4,554 6 View

Is the data in Fig.5 of this paper obtained as the response to an external stimulus of given frequency?

In this publication (caption to Fig.5) you state that the sheer existence of (electromagetic) resonances in metallic cavities disproves the idea of such cavities containing black body radiation in...

24 April 2014 1,471 3 View

Is there a method for thinning a Si(111) wafer to <= 1 micron thickness on limited area (< 1mm^2)?

Is there e.g. a photo-electrochemical etching method which can be applied to (111) oriented Si wafers? Would prefer not having to buy a RIE machine and doing lithography. Is there a liquid phase...

20 February 2014 4,079 11 View

On the notion of a 'van Vleck ion'

My first understanding of 'van Vleck paramagnetism' refers to open shell configurations short of half filling by one electron. In LS coupling we then have L=S and by the third Hund's rule we...

11 April 2013 4,102 5 View

Have you tested varying experimental parameters beyond laser on/off?

Louis, fascinating results, it appears. What is the profile of your light beam? How much of the area between the masses does it cover? Does it matter? Can you report on dependencies on laser...

01 February 2013 7,139 2 View