# BPeak and $\beta$ relaxation


## $\beta$ relaxation is due to BPeak

- thermally excited BPeak (liquid-like internal excitations) modes scatter/relax low-frequency phonons at 50K

- but **at higher temperatures equal-population of BPeak modes makes scattering very very weak - right?**

- real motions start close to the glass transition itself


![cc](https://knowen-production.s3.amazonaws.com/uploads/attachment/file/5475/friction.png 'bb')

## 2016 [An Overview on Short and Long Time Relaxations in Glass-forming Supercooled Liquids](https://iopscience.iop.org/article/10.1088/1742-6596/759/1/012008/pdf)

 The short time relaxation is known as β-relaxation and the final long time relaxation is called α-relaxation
 
 These results provide a clear connection between short-time dynamics and long-time structural relaxation in glass-forming liquids.





# Parents

* Boson peak in glasses
* $\alpha$ and $\beta$ relaxation⏎