Patent US4994745A successfully refreshed from Google Patents.
← Back to Patent Explorer
US4994745A Expired / Lapsed US ⏱️ 0.0 years remaining

Electron spin resonance spectroscopy

Assignee: Jeol Ltd
•
Filing: 1990-01-23
•
Granted: 1991-02-19
•
Expires: 2010-01-23
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract There is disclosed a method of accurately calculating the magnetic field strength at an arbitrary position in an ESR (electron spin resonance) spectrum using Mn 2+ marker. The spectrum contains an ESR signal arising from an unknown sample and an ESR signal arising from a reference sample containing Mn 2+ marker. The resonating magnetic field strengths H ci and H cj of two absorption lines of the six absorption lines arising from Mn 2+ are calculated from the applied microwave frequency, the nuclear spin quantum numbers m Ii and m Ij producing the two absorption lines, a predetermined g value g o intrinsic to Mn 2+ , and a predetermined isotropic hyperfine coupling constant A. The magnetic field strength H cx at a position of interest in the ESR spectrum is determined from the distance between the absorption lines, the distance between the position and one of the two absorption lines, and the magnetic field strengths H ci , H cj .

Inventors

  • 👤 Yukio Mizuta

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 09:16
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/60; G01R33/24

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 245 words
Electron spin resonance spectroscopy method comprising the steps of: (a) obtaining an ESR spectrum containing both an ESR signal arising from a sample to be investigated and an ESR signal arising from Mn 2+ contained in a reference sample; (b) knowing the frequency ν of microwaves used to obtain the ESR spectrum; (c) calculating the resonating magnetic field strengths H ci and H cj of two absorption lines S i and S j (i, j=1, 2, 3, . . . , 6; i≠j) of the six absorption lines S 1 -S 6 arising from Mn 2+ , from the microwave frequency ν, the nuclear spin quantum numbers m Ii , m Ij giving rise to the two absorption lines, a predetermined g value g o intrinsic to Mn 2+ , and a predetermined isotropic hyperfine coupling constant A, and in accordance with the following formulas: H.sub.c =H.sub.o -A m.sub.I -A.sup.2 {(I+1)-m.sub.I.sup.2 }2H.sub.o H.sub.o =h.sub.ν /g.sub.o β where I=5/2, m I1 =5/2, m I2 =3/2, m I3 1/2, m I4 =-1/2, m I5 =-3/2, m I6 =-5/2, h is the Planck's constant, and β is the Bohr magneton; (d) finding the magnetic field strength Hcx at a position x of interest from the distance between the two absorption lines S i and S j in the ESR spectrum, the distance between the position x and one of said two absorption lines in the spectrum, and the resonating magnetic field, strengths H ci , H cj .
Claim 2
Dependent Claim 245 words
Electron spin resonance spectroscopy method comprising the steps of: (a) obtaining an ESR spectrum containing both an ESR signal arising from a sample to be investigated and an ESR signal arising from Mn 2+ contained in a reference sample; (b) knowing the frequency ν of microwaves used to obtain the ESR spectrum; (c) calculating the resonating magnetic field strengths H ci and H cj of two absorption lines S i and S j (i, j=1, 2, 3, . . . , 6; i≠j) of the six absorption lines S 1 -S 6 arising from Mn 2+ , from the microwave frequency ν, the nuclear spin quantum numbers m Ii , m Ij giving rise to the two absorption lines, a predetermined g value g o intrinsic to Mn 2+ , and a predetermined isotropic hyperfine coupling constant A, and in accordance with the following formulas: H.sub.c =H.sub.o -A m.sub.I -A.sup.2 {(I+1)-m.sub.I.sup.2 }2H.sub.o H.sub.o =h.sub.ν /g.sub.o β where I=5/2, m I1 =5/2, m I2 =3/2, m I3 1/2, m I4 =-1/2, m I5 =-3/2, m I6 =-5/2, h is the Planck's constant, and β is the Bohr magneton; (d) finding the magnetic field strength Hcx at a position x of interest from the distance between the two absorption lines S i and S j in the ESR spectrum, the distance between the position x and one of said two absorption lines in the spectrum, and the resonating magnetic field, strengths H ci , H cj .
Claim 3
Dependent Claim 43 words
The electron spin resonance spectroscopy of claim 1, further including the step of calculating the g value g x at the position x of interest from the magnetic field strength H cx found at step (d) in accordance with the formula g.sub.x =hν/βH.sub.cx.

References Cited (Backward Citations)

US3348136A Cited
US3371271A Cited
US4376264A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1994-02-18 1994-08-20 1995-02-19 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1998-02-18 1998-08-20 1999-02-19 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2002-02-18 2002-08-20 2003-02-19 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag