User contributions for Kkmurray

4 July 2025

• 16:1416:14, 4 July 2025 diff hist +149 Y-ion No edit summary current
• 16:1216:12, 4 July 2025 diff hist +77 Stable isotope labeling of amino acids in cell culture No edit summary current
• 16:0916:09, 4 July 2025 diff hist +8 N Lipidomics Created page with "{{stub}}" current
• 12:0712:07, 4 July 2025 diff hist +477 Aston 1922/Chapter 1 No edit summary

3 July 2025

• 20:4020:40, 3 July 2025 diff hist +1 McLafferty rearrangement →Images current
• 18:3918:39, 3 July 2025 diff hist +25 ASMS resources No edit summary current
• 18:3718:37, 3 July 2025 diff hist +70 ASMS 1974 No edit summary current
• 18:3418:34, 3 July 2025 diff hist +50 ASMS 1981 No edit summary current
• 18:2818:28, 3 July 2025 diff hist −16,913 Aston 1922 No edit summary
• 18:2618:26, 3 July 2025 diff hist +15 Aston 1922/Appendices No edit summary
• 18:2618:26, 3 July 2025 diff hist −6,790 Aston 1922 →APPENDIX I
• 18:2518:25, 3 July 2025 diff hist +4 Aston 1922/Appendices No edit summary
• 18:2418:24, 3 July 2025 diff hist +20,068 N Aston 1922/Appendices Created page with " ==APPENDIX I= Table of atomic weights and isotopes of the elements. The elements are given in order of their atomic numbers. The different periods are indicated by gaps after the inert gases. A curious relation, pointed out by Rydberg, is that the atomic numbers of all the inert gases are given by taking the series 2 (P + 2^ + 22 + 3^ + 3^ + 4^ + ) and stoppmg the summation at any term. This gives the numbers used by Langmuir (p. 95). The atomic weights given are t..."
• 18:2318:23, 3 July 2025 diff hist −13,383 Aston 1922 →CHAPTER X - THE SPECTRA OF ISOTOPES
• 18:2018:20, 3 July 2025 diff hist +11,525 N Aston 1922/Chapter 10 Created page with "'''CHAPTER X - THE SPECTRA OF ISOTOPES''' ==108. The Spectra of isotopes== As has already been stated the first experimental work on the spectra of isotopes was that of Russell and Rossi in 1912 who failed to distinguish any difference between the spectrum of thorium and that of a mixture of thorium and ionium containing a considerable percentage of the latter. The same negative result was obtained by Exner and Haschek. During the fractional diffusion of neon no spectro..."
• 18:1418:14, 3 July 2025 diff hist −29,107 Aston 1922 →CHAPTER XI - THE SEPARATION OF ISOTOPES
• 18:1418:14, 3 July 2025 diff hist +25 Aston 1922 →CHAPTER XI - THE SEPARATION OF ISOTOPES
• 18:1418:14, 3 July 2025 diff hist +25,003 N Aston 1922/Chapter 11 Created page with "'''CHAPTER XI - THE SEPARATION OF ISOTOPES''' ==113. The Separation of Isotopes== The importance, from purely practical and technical points of view, of the theory of isotopes would have been insignificant had its application been confined to the radioactive elements and their products, which are only present in infinitesimal quantities on the Earth. But now that the isotopic nature of many elements in everyday use has been demonstrated, the possibility of their sep..."
• 18:0618:06, 3 July 2025 diff hist 0 m Aston 1922/Chapter 9 Kkmurray moved page Aston1922/Chapter 9 to Aston 1922/Chapter 9: Misspelled title
• 18:0518:05, 3 July 2025 diff hist −30,145 Aston 1922 →CHAPTER IX - ISOTOPES AND ATOMIC NUMBERS
• 18:0418:04, 3 July 2025 diff hist +25,818 N Aston 1922/Chapter 9 Created page with "'''CHAPTER IX - ISOTOPES AND ATOMIC NUMBERS''' ==100. The relation between chemical atomic weight and atomic number== Inasmuch as it is now recognised to be in general merely a statistical mean value the importance of the chemical atomic weight has been greatly reduced by the discovery of isotopes. Its position as the natural numerical constant associated with an element has been taken by the atomic number, though from the point of view of chemical analysis the chemical..."
• 17:5817:58, 3 July 2025 diff hist +1 Aston 1922 →CHAPTER VIII - THE ELECTRICAL THEORY OF MATTER
• 17:5817:58, 3 July 2025 diff hist −40,969 Aston 1922 →CHAPTER VIII - THE ELECTRICAL THEORY OF MATTER
• 17:5717:57, 3 July 2025 diff hist +35,205 N Aston 1922/Chapter 8 Created page with "'''CHAPTER VIII - THE ELECTRICAL THEORY OF MATTER''' ==84. The Whole Number rule== By far the most important result of the measurements detailed in the foregoing chapters is that, with the exception of hydrogen, the weights of the atoms of all the elements measured, and therefore almost certainly of all elements, are whole numbers to the accuracy of experiment, in most cases about one part in a thousand. Of course, the error expressed in fractions of a unit increases wit..."
• 17:5017:50, 3 July 2025 diff hist +17,032 N Aston 1922/Chapter 7 Created page with "'''CHAPTER VII - ANALYSIS OF THE ELEMENTS (Continued)''' ==72. Positive Rays of Metallic Elements== Positive rays of most of the metallic elements cannot be obtained by the ordinary discharge-tube method, since in general they have extremely low vapom'-pressures and are incapable of forming stable volatile compounds. Mercury is a notable exception to this rule, and its rays are exceedingly easy to produce. Positively charged rays which appeared to be atoms of the alkali..."
• 17:4617:46, 3 July 2025 diff hist −20,970 Aston 1922 →CHAPTER VII - ANALYSIS OF THE ELEMENTS (Continued)
• 17:4517:45, 3 July 2025 diff hist +37,205 N Aston 1922/Chapter 6 Created page with "==50. Arrangement of results== In this Chapter and the one following it are given the experimental results obtained from a large number of elements which have been subjected to analysis with a view to determining their constitution. This Chapter deals with those elements which, by reason of their volatiUty or properties of forming volatile compounds, can be treated by the ordinary discharge-tube method. The analysis given in all these cases is that obtained by means of t..."
• 17:4217:42, 3 July 2025 diff hist −43,087 Aston 1922 →CHAPTER VI - ANALYSIS OF THE ELEMENTS
• 17:4017:40, 3 July 2025 diff hist +48,916 N Aston 1922/Chapter 5 Created page with "===30. Limitations of the parabola method=== The parabola method of analysis of positive rays described in Chapter III, though almost ideal for a general survey of masses and velocities, has objections as a method of precision, many rays are lost by colUsion in the narrow canal-ray tube ; the mean pressure in which must be at least half that in the discharge-bulb ; very fine tubes silt up by disintegration un..."
• 17:4017:40, 3 July 2025 diff hist −48,893 Aston 1922 →CHAPTER V - THE MASS-SPECTROGRAPH
• 17:3917:39, 3 July 2025 diff hist +21,134 N Aston 1922/Chapter 4 Created page with "===23. Positive Ray Analysis of Neon=== It is a curious and interesting point that while the first suggestion of the possi- bility of the occurrence of isotopes was obtained from the rarest of all substances on the earth's surface the radio= active elements and their products ; so the first result indicating the possibility of isotopes among the stable elements was yielded by neon, a gas of which, in a purifi..."
• 17:3917:39, 3 July 2025 diff hist −21,110 Aston 1922 →CHAPTER IV - NEON
• 17:3817:38, 3 July 2025 diff hist −7,615 Aston 1922 →CONTENTS
• 17:3817:38, 3 July 2025 diff hist 0 m Aston 1922/Contents Kkmurray moved page Aston 2022/Contents to Aston 1922/Contents: Misspelled title current
• 17:3717:37, 3 July 2025 diff hist +7,651 N Aston 1922/Contents Created page with "==CONTENTS== CHAPTER I Introduction 1. Introduction ..... 2. Hypothesis of Dalton and Prout 3. Crookes' Meta-elements . 4. The discovery of Isotopes PAGE 1 2 4, 6 CHAPTER II The Radioactive Isotopes 5. Chemical identities among the radioactive elements 6. Spectroscopic identity of isotopes . 7. The chemical law of Radioactive change 8. Isobares ...... 9. The Radioactive Transformations . 10. The Atomic we..."
• 17:3617:36, 3 July 2025 diff hist −25,935 Aston 1922 →CHAPTER III - POSITIVE RAYS
• 17:3617:36, 3 July 2025 diff hist −33,926 Aston 1922 →CHAPTER II - THE RADIOACTIVE ISOTOPES
• 17:3417:34, 3 July 2025 diff hist 0 m Aston 1922/Chapter 3 Kkmurray moved page Aston 2022/Chapter 3 to Aston 1922/Chapter 3: Misspelled title
• 17:2917:29, 3 July 2025 diff hist +25,995 N Aston 1922/Chapter 3 Created page with "==CHAPTER III - POSITIVE RAYS== ===14. Nature of Positive Rays=== Positive rays were dis- covered by Goldstein in 1886 in electrical discharge at low pressure. In some experiments with a perforated cathode he noticed streamers of Hght behind the perforations. This luminosity, he assumed, was due to rays of some sort which travelled in the opposite direction to the cathode rays and so passed through the apertures i..."
• 17:2817:28, 3 July 2025 diff hist +44 Aston 1922 No edit summary
• 17:2617:26, 3 July 2025 diff hist +34 N Aston 1922 Chapter 1 Kkmurray moved page Aston 1922 Chapter 1 to Aston 1922/Chapter 1: change to sub page current Tag: New redirect
• 17:2617:26, 3 July 2025 diff hist 0 m Aston 1922/Chapter 1 Kkmurray moved page Aston 1922 Chapter 1 to Aston 1922/Chapter 1: change to sub page
• 17:2417:24, 3 July 2025 diff hist +34,000 N Aston 1922/Chapter 2 Created page with " ==CHAPTER II - THE RADIOACTIVE ISOTOPES== ===5. Chemical identities among the radioactive elements=== Apart from the purely speculative considerations which have aheady been detailed, the theory of isotopes had its birth in the gigantic forward wave of human knowledge inaugurated by the discovery of radioactivity. It can admit- tedly be argued that, even if no radioactive elements existed, isotopes would inevitably..."
• 17:1717:17, 3 July 2025 diff hist +144 Aston 1922 →10. The Atomic Weight of Lead
• 16:5716:57, 3 July 2025 diff hist +100 Linked scan at constant B(1-(E/E0))1/2/E No edit summary current
• 16:5516:55, 3 July 2025 diff hist −69 Linked scan at constant B(1-(E/E0))1/2/E No edit summary
• 16:5316:53, 3 July 2025 diff hist +69 Linked scan at constant B(1-(E/E0))1/2/E No edit summary
• 15:4815:48, 3 July 2025 diff hist +45 Talk:Linked scan at constant B(1-(E/E0))1/2/E →Test of math extension current
• 15:3815:38, 3 July 2025 diff hist +132 Talk:Linked scan at constant B(1-(E/E0))1/2/E No edit summary
• 15:2615:26, 3 July 2025 diff hist +43 N Talk:Linked scan at constant B(1-(E/E0))1/2/E Created page with "Test of math extension: <math>E=mc^2</math>"