Calculation of mode to mode phonon scattering rate for 3-phonon process using Alamode

[ballal09]

Dear Dr. Tadano

I hope you are doing well. I am trying to calculate 3-phonon mode-to-mode scattering rates for my system (like as shown in the figure) using Alamode. I think maybe there is way to calculate it from the scattering phase space (SPS) but I don't know exactly how to do it using alamode. I would highly appreciate if you could provide some insights on that. Thank you very much for your time.

Reference: J. Phys. Chem. A 2021, 125, 35, 7723–7734

Here, the mode-to-mode scattering rate is defined by the following equation:

where, n_0 is the equilibrium phonon population for the respective branch and L is defined as the following way

[ttadano]

Hi,

This quantity cannot be calculated only from SPS as it requires |V^3|^2. Currently, ALAMODE cannot print out this quantity. If this information is quite useful, I will consider implementing it for a future release.

[ballal09]

Dear Dr. Tadano

Thank you very much for your response. Yes , If you could do that in the next version, it will be helpful.