Dear All,

Thanks everyone for your help and comments. I hope it helps me with my work.
Please let me know if anybody comes along any such similar observations.
Thanks once again.

Regards,
Debashis Maji


On Thu, Sep 9, 2010 at 10:03 AM, Purvi Kikani  wrote:

> Hi All,
>
> We have also recently observed something similar in our experiments. We
> produced air plasma in parallel plate config. using two different power
> source in two seperate but identical reactors. In one reactor we used 40 KHz
> AC and in other we used 13.56 MHz RF. keeping all other parameters same.
>
> In result, 40 KHz reactor gave purple color plasma and 13.56 MHz gave pink
> color plasma. Here power, pressure and all other cong. except source is
> same.
>
> what can be the reason of this ? 13.56 MHz plasma is Nitrogen excitation
> dominated and 40 KHz some other ? can anyone please through some light on
> this ?
>
> Thanks & Regards;
> Ms. Purvi Kikani Dave (M.Sc. Physics)
> Facilitation Center for Industrial Plasma Technologies (FCIPT)
> Institute for Plasma Research (IPR)
> Department of Atomic Energy,
>  Government of India
> Gandhinagar, Gujarat,
> India Phone # +91 079 23269014(O), +91 9979704390 (M)
> Alternate email: purvi@ipr.res.in, purvi2505@gmail.com
>
> --- On Thu, 9/9/10, Birol Kuyel  wrote:
>
> From: Birol Kuyel 
> Subject: Re: [mems-talk] Argon plasma color
> To: "'General MEMS discussion'" 
> Date: Thursday, 9 September, 2010, 12:04 AM
>
> Dear Debashish,
>
> At higher energy Ar Plasma color goes to purple to blue: (email me directly
> at main@nanomaster.com) to see two pictures on
> the bottom of the WG where one plate is in Ar plasma the second one is in
> the same plasma with -1000V bias.
>
> On the other hand, in sputtering, plasma in front of the magnetron changes
> color with the material being sputtered as well; for example Cu would make
> the plasma color Green.
>
> Power and pressure relates to brightness of the color (plasma density) but
> if you further increase or lower the pressure you would lose the plasma
> altogether.
>
> Regards,
>
> Birol Kuyel, Ph.D.
> Nano-Master Inc.