Michael Davis <mdavis19@ix.netcom.com> wrote in message
news:2a09fbbfb6e0bd67e177175d9281f517@news.meganetnews.com...

> No. When the isolated hydrogen atom absorbs the photon, it just
> gets kicked off in some direction from the recoil. The energy of
> the light gets converted into kinetic energy. If there is nothing
> for the hydrogen atom to run into, then that kinetic energy can't
> be converted into heat.

OK, I'll buy that.
Although temperature and heat aren't the same "thing", trying to think of
one without the other does seem fruitless, and heat doesn't apply to one
particle.
That makes sense to me.  Thanks.