A High Resolution Mass Spectrometer With Multi-stage Fields

HISASHI MATSUDA

doi:10.5702/massspec1953.14.78

HISASHI MATSUDA

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JOURNAL FREE ACCESS

1966 Volume 14 Issue 2 Pages 78-81

DOI https://doi.org/10.5702/massspec1953.14.78

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Published: June 01, 1966 Received: May 02, 1966 Available on J-STAGE: June 28, 2010 Accepted: - Advance online publication: - Revised: -
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Date of correction: June 28, 2010 Reason for correction: - Correction: DTRECEIVED Details: Right : 19660502

Date of correction: June 28, 2010 Reason for correction: - Correction: ABSTRACT Details: Wrong : A mass spectrometer which may have very large mass dispersion and resolving power is proposed. Consider the tandem combination of n cylindrical electrostatic analyzers of sector type(opposite deflections to each other)with the same a_e, Φ_e, and magnification X(<1)each, and the tandem combination of n homogeneous magnetic analyzers of sector type(opposite deflections to each other) with the same am, a_m, Φ_m and magnification 1/X each. These two groups of the fields are connected in tandem so that the deflection in the final electric field and that in the first magnetic field are in the same sense. The double focusing condition is satisfied if a_e=a_m=a. The total magnification of the image is1, while the mass dispersion at the final image is given as follows:D_m=a/2(1+1/X)(1+1/X+1/X²;+…+1/X)γ^n-1.If X is very small and n large, then very large mass dispersion and resolving power may be expected. For example, in the case X=1/3, n=3, a_e=a_m=100cm, Φ_e=63°39', Φm=90°, mass dispersion of 2600 γ cm and resolving power of 26, 000, 000/sμ are expected.
Right : A mass spectrometer which may have very large mass dispersion and resolving power is proposed. Consider the tandem combination of n cylindrical electrostatic analyzers of sector type (opposite deflections to each other) with the same a_e, Φ_e, and magnification X(<1)each, and the tandem combination of n homogeneous magnetic analyzers of sector type (opposite deflections to each other) with the same a_m, Φ_m and magnification 1/X each. These two groups of the fields are connected in tandem so that the deflection in the final electric field and that in the first magnetic field are in the same sense. The double focusing condition is satisfied if a_e=a_m=a. The total magnification of the image is 1, while the mass dispersion at the final image is given as follows:
D_m=a/2(1+1/X)(1+1/X+1/X²;+…+1/X^n-1)γ.
If X is very small and n large, then very large mass dispersion and resolving power may be expected. For example, in the case X=1/3, n=3, a_e=a_m=100 cm, Φ_e=63°39′, Φ_m=90°, mass dispersion of 2600 γ cm and resolving power of 26, 000, 000/sμ are expected.

Date of correction: June 28, 2010 Reason for correction: - Correction: CITATION Details: Right : K. Ogata and H. Matsuda, Z. Naturforschg., 10a,843(1955).

Abstract

A mass spectrometer which may have very large mass dispersion and resolving power is proposed. Consider the tandem combination of n cylindrical electrostatic analyzers of sector type (opposite deflections to each other) with the same a_e, Φ_e, and magnification X(<1)each, and the tandem combination of n homogeneous magnetic analyzers of sector type (opposite deflections to each other) with the same a_m, Φ_m and magnification 1/X each. These two groups of the fields are connected in tandem so that the deflection in the final electric field and that in the first magnetic field are in the same sense. The double focusing condition is satisfied if a_e=a_m=a. The total magnification of the image is 1, while the mass dispersion at the final image is given as follows:
D_m=a/2(1+1/X)(1+1/X+1/X²;+…+1/X^n-1)γ.
If X is very small and n large, then very large mass dispersion and resolving power may be expected. For example, in the case X=1/3, n=3, a_e=a_m=100 cm, Φ_e=63°39′, Φ_m=90°, mass dispersion of 2600 γ cm and resolving power of 26, 000, 000/sμ are expected.

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