Nier-Johnson geometry

IUPAC RECOMMENDATIONS 2013
Nier-Johnson geometry
Arrangement for a double-focusing mass spectrometer in which a deflection of π/2 rad in a radial electrostatic energy analyzer is combined with a magnetic deflection of π/3 rad, thus providing a single point of focus for ions of the same m/z but with spreads in both trajectory direction and translational energy.
Related Term(s): Mattauch-Herzog geometry
Reference(s): From IUPAC. Analytical Division. Compendium of Analytical Nomenclature (the Orange Book). Definitive Rules, 1979. Compiled by J. Inczdy, T. Lengyel, A. M. Ure. Blackwell Scientific Publications, Oxford (1997). On-line corrected version: http://www.iupac.org /publications/analytical compendium (2000). IUPAC. Compendium of Chemical Terminology, 2nd ed. (the Gold Book). Compiled by A. D. McNaught and A.Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. using additional information from W. H. Johnson, A. O. Nier. Phys. Rev. 105, 1014 (1957). (http://dx.doi.org/10.1103/PhysRev.105.1014 )
From Definitions of Terms Relating to Mass Spectrometry (IUPAC Recommendations 2013); DOI: 10.1351/PAC-REC-06-04-06 © IUPAC 2013.
Index of Recommended Terms

---

Orange Book

ORANGE BOOK DEFINITION IUPAC. Analytical Division. Compendium of Analytical Nomenclature (the Orange Book). Definitive Rules, 1979 (see also Orange Book 2023)
Nier-Johnson geometry
An arrangement for a double-focusing mass spectrometer in which a deflection of π/2 radians in a radial electrostatic field analyser is followed by a magnetic deflection of π/3 radians. The electrostatic analyser uses a symmetrical object-image arrangement and the magnetic analyser is used asymmetrically.
IUPAC 1997 Orange Book Chapter 12
Index of Orange Book Terms

Gold Book

GOLD BOOK DEFINITION IUPAC. Compendium of Chemical Terminology, 2nd ed. (the Gold Book). Compiled by A. D. McNaught and A.Wilkinson. Blackwell Scientific Publications, Oxford (1997).
Nier-Johnson geometry
http://goldbook.iupac.org/N04141.html An arrangement for a double-focusing mass spectrometer in which a deflection of π/2 radians in a radial electrostatic field analyser is followed by a magnetic deflection of π/3 radians. The electrostatic analyser uses a symmetrical object-image arrangement and the magnetic analyser is used asymmetrically. Source: PAC, 1991, 63, 1541 (Recommendations for nomenclature and symbolism for mass spectroscopy (including an appendix of terms used in vacuum technology). (Recommendations 1991)) on page 1546 Orange Book, p. 201
IUPAC Gold Book
Index of Gold Book Terms

Gallery

Components of a mass spectrometer as designed by Alfred Otto Carl Nier (1911-1994).