Table 1 Relaxation times and their relative errors obtained by ESS and QENS.

From: Elastic Scattering Spectroscopy (ESS): an Instrument-Concept for Dynamics of Complex (Bio-) Systems From Elastic Neutron Scattering

τ_INPUT/μeV

τ_ESS/μeV

τ_QENS/μeV

Δτ/τ ESS %

Δτ/τ QENS %

5

4,918

5,250

−1,637

4,990

6

6,492

6,102

8,200

1,708

8

8,585

8,522

7,306

6,522

10

10,136

10,404

1,355

4,038

12

11,240

12,874

−6,338

7,284

  

<Δτ/τ>/%

4,967

4,908

  1. ESS adopts a model-free approach aimed to extract the abscissa of inflection points, whereas QENS needs an a priori model that here was the same one used as input in the simulations, something that is not possible in real experiments where any model can be proposed a priori. The error on the relative error is 1.2%, so ESS and QENS have the same ability but QENS was given all the advantages, which is not usually realistic in practice.
Back to article page