I would like to thank Thomas Barbara, Rainer Haessner, Charlie Dickinson,
Markus Voehler, Bill Stevens, and all others who read and answered my
question.
When the probe was made in the manufacture, the coil was made from material
with the same volume susceptibility as the cooling gas. For high field
NMR(>500 MHz), all probe coils are balanced to nitrogen. In such case,
using air (containing paramagnetic oxygen) as the cooling gas will cause
line broadening.
Weixing Zhang
-----Original Message-----
> From: Zhang, Weixing [mailto:Weixing.Zhang_at_stjude.org]
> Sent: Tuesday, October 08, 2002 9:45 AM
> To: AMMRL (E-mail)
> Subject: N2 vs air as cooling gas
Hi all,
I know that some people use dry and clean air as cooling gas for NMR
experiment, while others use nitrogen gas.
Somebody told me that nitrogen gas is preferred over air for high resolution
NMR experiment because line is narrower if
nitrogen gas is used as the cooling gas. I do not know if this is true or
not, but your input is highly appreciated.
Weixing Zhang, Ph.D.
Department of Structural Biology
St. Jude Children's Research Hospital
Voice: (901)495-3169
FAX: (901)495-3032
http://www.stjude.org/sb/wzhang.htm
http://www.stjude.org/sb/nmr.htm
Received on Wed Oct 09 2002 - 13:10:10 MST