Home | News | Documentation | Download

What is needed in a mobility file?


I have recently gone through this paper, http://dx.doi.org/10.1006/adnd.1995.1004, which is, I think, where all of the mobility data currently available in Garfield++ is from based on this q&a that I found, https://garfieldpp.web.cern.ch/garfieldpp/qa/index.php?qa=109&qa_1=the-importance-of-ion-mobility-data. However, when I compare what is written on the Garfield++ mobility files with the correspondents in the paper, things do not seem to agree. For example, for He+, we have

# ------------------------------------------------------------
# Mobility of He+ ions in He measured at T=300 K              
# Accuracy: 1 % to E/N=60, 3 % for higher E/N                 
# Data from Ellis 1976
# ------------------------------------------------------------ 
  6  10.3
  8  10.2
 10  10.2
 12  10.1
 15  10.0
 20   9.90
 25   9.74
 30   9.60
 40   9.28
 50   8.97
 60   8.67
 80   8.12
100   7.67
120   7.25
150   6.78
200   6.12
250   5.60
300   5.19
400   4.58
500   4.17
600   3.81
700   3.57

However, this is what I found from the paper for He+,

When I look at the two tables, I am not sure what is imported from the paper to form the Garfield mobility file. So, what are the values from the Garfield mobility data?

Also, I recently came across this relatively recent paper, https://iopscience.iop.org/article/10.1088/1748-0221/14/04/P04010/pdf, which presents experimental measurements of ion mobility for isobutane. Does the paper have what needed to form a Garfield mobility file? I am interested in drifting ions inside of isobutane gas, which is one of the gases that currently has no mobility file for.

the data for He+ in He above are from this paper:

I’ve not had time yet to read the paper which has measurements for isobutane in detail, but yes, it looks useful.

1 Like


Thank you for the clarification. I found the data in the Ellis paper.

This topic was automatically closed 14 days after the last reply. New replies are no longer allowed.