Talk:Direct analysis in real time

Wiki Education Foundation-supported course assignment

This article is or was the subject of a Wiki Education Foundation-supported course assignment. Further details are available on the course page. Student editor(s): Achaladk. Peer reviewers: Dideolu.

Above undated message substituted from Template:Dashboard.wikiedu.org assignment by PrimeBOT (talk) 19:33, 16 January 2022 (UTC)

Questionable negative Ion formation process

I deleted the section about the negative ion formation process because the mechanism will not work as proposed in the article (M* + surface ---> M+ + surface + e-). If in this case the He metastable (denoted as M) has an energy of 19.8 eV. The ionization potential of He is 25 eV. Thus in order to get the excited He into an ionized state(denoted as M+) you would have to let it collide with the surface with at least 5.2 eV....this is under these conditions not possible, because this kinetic energy would correspond to a velocity of around 15500 m/s (approx. mach 45)!

--Stomnerd (talk) 05:22, 23 May 2010 (UTC)

How about M* + surface ---> M + surface + e- (surface Penning ionization)? See [1]; the other reactions then follow. --Kkmurray (talk) 04:55, 24 May 2010 (UTC)

--Rbcody (talk) 18:13, 24 May 2018 (UTC) The negative-ion formation process was actually correct in the first place. The kinetic energy of the metastable atom does not play a role. This is surface Penning ionization, not collisional ionization of He*. Surface Penning ionization involves the release of an electron from the surface metal upon interaction with an excited state. The ionization energy of Molybdenum, the metal typically used for the DARt exit electrode, is 7.09 eV. Surface Penning ionization is well known, and it is the basis for a form of surface analysis by detecting the energy of electrons released upon bombardment by metastable atoms.

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DART ion source

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CHEM 4558-Spring 2018

DART ion source

I am planning to improve this article by adding and changing the content relevant to the italicized points.
1)Principle of operation

   1.1 Basis DART setup and concept
   1.2 Ionization process[Negative ion formation with detail, Reaction zone and interface]
   1.3 Formation of metastable species

2)Source to analyzer interface 3)Mass spectra

   3.1 Mass range and Gas temperature

4) Configurations of DART

    4.1 Surface desorption mode
    4.2 Transmission mode

5) Categorizing DART
6)Applications[Coupling with separation techniques, Quantification, Aerosol analysis]

Bibliography

• Gross, Jürgen H. "Direct analysis in real time—a critical review on DART-MS". Analytical and Bioanalytical Chemistry. 406 (1): 63–80. doi:10.1007/s00216-013-7316-0
• Dass, Chhabil (2001). Principles and practice of biological mass spectrometry. New York, NY [u.a.]: Wiley. ISBN 0471330531.
• Nilles, J. Michael; Connell, Theresa R.; Durst, H. Dupont (15 August 2009). "Quantitation of Chemical Warfare Agents Using the Direct Analysis in Real Time (DART) Technique". Analytical Chemistry. 81 (16): 6744–6749. doi:10.1021/ac900682f.

Achaladk (talk) 18:38, 15 February 2018 (UTC)

You can also use more general ambient mass spectrometry review articles, for example Huang 2011, Javanshad 2017, Smoluch 2016. --Kkmurray (talk) 21:58, 15 February 2018 (UTC)

Article currently has appropriate supporting materials, but it assumes technical background and could use a little more editing to make it understandable to a much wider non-technical audience.

Thanks. Dideolu (talk) 14:15, 29 March 2018 (UTC)

Hi Achaladk, Good work so far. 1) Most of the contents in the article is related to the topic. 2) The article has a neutral tone. I didn't notice any major bias. 3) Citations are relevant to the article and the sources support facts you used in the article. Also, links are well-formatted and most sources are secondary (which is good). However, try to explain or totally replace technical terms used with easy-to-understand phrases, as the article still seems overly technical for a general audience.

Thanks! Dideolu (talk) 22:33, 7 April 2018 (UTC)