Hg：L-S coupling or j-j coupling?

[phdphysics]

When testing Bohr's theory by Franck-Hertz experiment, we have electrons colliding with Hg atoms. a Hg atom will absorb electron's energy when this energy can make it jumping to a higher energy level. I wonder Hg is more like L-S coupling or j-j coupling, for I want to measure its higher excited state by accelerating electrons faster.
By the way, I have known that L-S coupling is effected when residual electrostatic is far lager than spin-orbit interaction.

Thank you!

 

[Andy Resnick]

There are both LS and j-j transitions in Hg I. For example, the 253.7 nm line is LS-forbidden but j-j allowed, and is in fact one of the brightest spectral lines.

NIST maintains a comprehensive searchable online database:

http://physics.nist.gov/PhysRefData/ASD/lines_form.html

 

[phdphysics]

Thank you!That database is very useful!