dorsal/arxiv
View SchemaThe Ramsey method in high-precision mass spectrometry with Penning traps: Experimental results
| Authors | S. George, K. Blaum, F. Herfurth, A. Herlert, M. Kretzschmar, S. Nagy, S. Schwarz, L. Schweikhard, C. Yazidjian |
|---|---|
| Categories | |
| ArXiv ID | physics/0701236 |
| URL | https://arxiv.org/abs/physics/0701236 |
| DOI | 10.1016/j.ijms.2007.04.003 |
| Journal | Int. J. Mass. Spectrom. 264 (2007) 110-121 |
Abstract
The highest precision in direct mass measurements is obtained with Penning trap mass spectrometry. Most experiments use the interconversion of the magnetron and cyclotron motional modes of the stored ion due to excitation by external radiofrequency-quadrupole fields. In this work a new excitation scheme, Ramsey's method of time-separated oscillatory fields, has been successfully tested. It has been shown to reduce significantly the uncertainty in the determination of the cyclotron frequency and thus of the ion mass of interest. The theoretical description of the ion motion excited with Ramsey's method in a Penning trap and subsequently the calculation of the resonance line shapes for different excitation times, pulse structures, and detunings of the quadrupole field has been carried out in a quantum mechanical framework and is discussed in detail in the preceding article in this journal by M. Kretzschmar. Here, the new excitation technique has been applied with the ISOLTRAP mass spectrometer at ISOLDE/CERN for mass measurements on stable as well as short-lived nuclides. The experimental resonances are in agreement with the theoretical predictions and a precision gain close to a factor of four was achieved compared to the use of the conventional excitation technique.
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"abstract": "The highest precision in direct mass measurements is obtained with Penning\ntrap mass spectrometry. Most experiments use the interconversion of the\nmagnetron and cyclotron motional modes of the stored ion due to excitation by\nexternal radiofrequency-quadrupole fields. In this work a new excitation\nscheme, Ramsey\u0027s method of time-separated oscillatory fields, has been\nsuccessfully tested. It has been shown to reduce significantly the uncertainty\nin the determination of the cyclotron frequency and thus of the ion mass of\ninterest. The theoretical description of the ion motion excited with Ramsey\u0027s\nmethod in a Penning trap and subsequently the calculation of the resonance line\nshapes for different excitation times, pulse structures, and detunings of the\nquadrupole field has been carried out in a quantum mechanical framework and is\ndiscussed in detail in the preceding article in this journal by M. Kretzschmar.\nHere, the new excitation technique has been applied with the ISOLTRAP mass\nspectrometer at ISOLDE/CERN for mass measurements on stable as well as\nshort-lived nuclides. The experimental resonances are in agreement with the\ntheoretical predictions and a precision gain close to a factor of four was\nachieved compared to the use of the conventional excitation technique.",
"arxiv_id": "physics/0701236",
"authors": [
"S. George",
"K. Blaum",
"F. Herfurth",
"A. Herlert",
"M. Kretzschmar",
"S. Nagy",
"S. Schwarz",
"L. Schweikhard",
"C. Yazidjian"
],
"categories": [
"physics.atom-ph",
"physics.gen-ph"
],
"doi": "10.1016/j.ijms.2007.04.003",
"journal_ref": "Int. J. Mass. Spectrom. 264 (2007) 110-121",
"title": "The Ramsey method in high-precision mass spectrometry with Penning traps: Experimental results",
"url": "https://arxiv.org/abs/physics/0701236"
},
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