A Quantitative Comparison of the Counting Significance of van Hove Integral Spectroscopy and Quasielastic Neutron Scattering

Abstract

matches that of the secondary spectrometer. In vHI the dynamics is probed instead by scanning the energy band-width of one of the two spectrometers, having the other at a fixed energy resolution value. Figure 1c show how a vHI profile is composed of elastic measurements.

Experimental demonstration of the novel “van-Hove integral method (vHI)” for measuring diffusive dynamics by elastic neutron scattering

“…Surprisingly, however, the counting statistics of the two methods are comparable even though the instrument used was expressly designed for QENS. This is in line with our previous studies showing that vHI can achieve tenfold better statistics at -level than QENS 81 , making the use in vHI-mode of the existing QENS backscattering spectrometers a feasible option for any interested users.…”

“…Whereas in our previous computational works 80 , 81 we were able to compare the with the input- , this is obviously not possible here. To judge the accuracy of the vHI method in accessing , we compared it with the obtained by carrying out a standard QENS experiment on the same instrument.…”

“…vHI has been formulated theoretically and proven by numerical and Monte-Carlo simulations 80 , 81 ; it is now accepted as valid. Here we present the first experimental proof of the method’s validity.…”

“…Since there are no spectrometers designed for vHI, this experimental test has been performed by modifying the procedure of a standard QENS high-resolution backscattering spectrometer to work in vHI mode. We recently used a similar procedure in a Monte-Carlo simulation of a neutron backscattering instrument that was equally capable of operating in either vHI or QENS mode 81 . Here we compare the -function obtained in vHI mode, , with that from the QENS mode, .…”

From just physics to biophysics of biological systems

“…We have also met very recently and in Sydney. This last-for the moment-meeting was in March 2020 on the occasion of my 1-month research visit to Oz hosted by the University of Sydney to work on my Elastic neutron scattering for dynamics project that I am carrying out with Prof. Gordon J. Kearley (Benedetto and Kearley 2019;Benedetto and Kearley 2020), another chap that I met in 2012 in Sydney. In this occasion, I have updated Cris on my last research interest, and he exchanged the favour telling me about his current research interest.…”