From: "hoping" <Hoffmann.Win@t-online.de>
Newsgroups: sci.physics.plasma
Subject: Re: Plasma Quench Technology
Organization: T-Online
References: <86dgro$3aa$1@jupiter.cs.uml.edu>


Hi Steve
I'm not familiar with the TiCl4 system, but a couple of years ago I did some
work on recombining plasmas with the aim of developing what I called then a
"plasmadynamic laser". The experiments were carried out in a supersonic
expanding hydrogen jet. In short, they were not very successful: I received
population inversion in atomic H levels but no lasing. Today I believe to
know why. You have to take into account ALL processes, and the problem is,
that you never know all their constants. If you are really interested in the
theoretical background I'll try to find some literature in the paper-orkus I
have here.
hoping

Steve Gerdemann <gerdeman@alrc.doe.gov> schrieb in im Newsbeitrag:
86dgro$3aa$1@jupiter.cs.uml.edu...
>
> A number of people have proposed that by rapidly quenching a plasma it is
> possible to produce non equilibrium conditions. For example by heating
TiCl4
> to 5000K in a plasma the TiCl4 breaks into Ti and Cl. Then all you have to
> do is quench the material very rapidly (say in an adiabatic expansion) to
> get Ti metal. I don't think this is possible because the Ti and Cl will
back
> react on the cool down. It seems to me that the only way for the Ti atom
to
> cool is to through either radiation or collision with another atom. But
> radiation would not be fast enough and collision would result in reaction.
>
> Is this correct or am I missing something? Is it possible to calculate the
> cooling rate required to limit back reaction to say.1%. Is there a good
book
> or other source that will help me understand this.
>
> Thanks
> Steve Gerdemann
>
>
>