THE ABSOLUTE ISOTOPIC ABUNDANCE RATIO AND THE ATOMIC WEIGHT OF NATURAL SILVER
An examination of the isotopic abundance ratio in natural silver by means of the mass spectrometer resulted in a value of 1.0733 plus or minus 0.0043 for the absolute isotopic abundance ratio Ag/sup 107//Ag/sup 109/. Specimens of commercial silver of diverse ages possess abundance ratios within the limits of the determinations and thus the calculated atomic weights are: chemical scale (O = 16) 107.8740 plus or minus 0.0033; physical scale (O/sup 16/ = 16) 107.9037 plus or minus 0.0026; unified scale (C/sup 12/ figures are the 95% confidence limits for the random errors added to estimates of possible systematic errors. These results are in very close agreement with recent work and differ significantly from the present internationally accepted values. It was shown that the mass discrimination in the mass spectrometers used is dependent on the magnitude of the isotopic ratio. When an electron multiplier is used the correction due to the differing isotopic masses of the ions accelerated to the same energy (approximately 8 kv) is directly proportional to the ratio of the square root of the masses with an accuracy of 4 parts in 10000. (auth)
- Research Organization:
- Atomic Energy Research Establishment, Harwell, Berks, Eng.
- NSA Number:
- NSA-16-011943
- OSTI ID:
- 4807106
- Journal Information:
- Journal of the Chemical Society (England) Divided into J. Chem. Soc. A, J. Chem. Soc. B, etc., Other Information: Orig. Receipt Date: 31-DEC-62
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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