So far we have collected 56 data points as the depth of the temperature quench echo from students.

The data are fitted to y=- a0 * exp(- x / a1) to get the dephasing time as a1, which is about 1.3 ps.

Good job, everybody !

Please sumit the depth of your quenched echo after you finish the exercises.

For the temperature echo poblem, tau values are assigned as the following:

(If  any one can not find his/her name in the list, please use tau=200 fs.)

• tau=100 fs

• tau=200 fs

• tau=300 fs

• tau=400 fs

• tau=500 fs

• tau=600 fs

• tau-700 fs

• tau=800 fs

• tau=900 fs