Electronic excitation transfer between inert gas atoms

3 ELECTRONIC EXCITATION TRANSFER BETWEEN INERT GAS ATOMS 

The changes in internal energy for transfer to 3j2,3s3,3s+ and 3s5 are, respectively, +387, +337, —357 and —441. The transition is optically forbidden for the helium, and allowed for the neon. The cross-section was recorded as 4 x 10-16 cm2. If this value is correct, it represents very efficient energy transfer because at 300 °K, on average only one collision in 6.8 has sufficient kinetic energy to supply the 

---