Dear Ranjini,

Thanks for your help. The sputtering system that we are using here is a DC
sputtering unit. I shall be highly obliged if you can kindly elaborate me on
the topic and/ or provide me with any relevant books or paper describing
this observation.

Also does the shift towards blue indicate that transitions are shifting from
higher energy levels (purple color) to lower energy levels (blue color)...
if so why is it happening at high voltages and/or high pressure..? Plz
correct me if I am wrong...

I shall be highly obliged if you can kindly provide me some insight to the
matter.

Thanking you,
Debashis
PhD scholar, IIT Kharagpur, India - 721302

On Wed, Sep 8, 2010 at 7:09 PM, Ranjini Menon wrote:

> Dear Debashish,
>
> when you vary the power or pressure in the system , then the number of
> charge particles/ or excited particles and their energy level varies. shift
> in color is due to change in available energy levels.
>
> what sort of plasma system do you have? RF CCP?