A recently developed 'quasiclassical ECS-E' fitting law for rotational
transition rates has been used for a detailed comparison of theoretic
al and experimental data on rotational energy relaxation in nitrogen.
A wide range of data on line broadening coefficients, ultrasonic absor
ption, population kinetics of isolated rotational levels exposed to la
ser pumping and population kinetics in a free jet has been analysed in
order to refine the effective intermolecular parameters of the model
thus providing a temperature-dependent form of the fitting law from 35
up to 1500 K.