Infrared Synchronous and Asynchronous maps calculated on the [1400-1300cm-1] range from dynamical measurements. The synchronous map shows clearly the coupling between the two vibrationals modes vN=N (1385cm-1) and vsNO2 (1339cm-1) who are moving in the same direction, while the asynchronous map reveals the distribution of reorientation rates of different vibrational modes.