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Forum: Particles
Re: Question low energy ions range in gases (Alfredo Tomás)
Date: 23 Nov, 2006
From: Vladimir IVANTCHENKO <>

On Thu, 23 Nov 2006, Alfredo Tomás wrote:

> *** Discussion title: Particles
> Email replies to must include:
>   In-Reply-To: <"/particles/303">
>   Subject: ...change this to be about your reply.
> Hello, people
> I'm launching ions in a gas target by the UI command:
> /ion 18 40 0
> I understand that means neutral Ar atom and
> /ion 18 40 1
> would means Ar+. Am I OK?


No, unfortunatelly this is not the case. Currently, whatever initial 
charge of ion we consider that the eqilibrium between the ion and the media is 
achieved in short time and ion has an effective charge depended 
on its velocity and the media and it is different from 
initial. This is, of course, a simplification, which may not be valid in 
low density media.


> The ions has been added the proces hLowEnergyIonization and the range of
> energies I'm interested in is about 100 keV.
> I observe the ions to show great changes in their direction even after
> the first hit (always produced by hLowEnergyIonization, and cut ~1um)
> and that is unexpected to me. Beacause it's a very diferent result of
> which we had when working with SRIM code.
> Thanks in advance.

    Vladimir Ivanchenko  
    ### CERN PH SFT Tel: +41-22-76-78-871 ###

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