lewis_1933 ========== G\. N\. Lewis and M\. F\. Ashley, "The Spin of Hydrogen Isotope", Phys\. Rev\. 43, 837 \(1933\) `Source record `__ · :doc:`Catalogue ` · :doc:`Review register ` DOI: `10\.1103/PhysRev\.43\.837\.2 `__ **Source kind:** measurement **Recorded technique:** Emission spectrum of molecular hydrogen containing about 25 % H1H1, 50 % H1H2 and 25 % H2H2, photographed in the first order of a 21\-foot grating; seven alpha\-bands \(Fulcher\) of H2H2 \(D2\) with P, Q and R branches examined \(p\. 837\)\. **Materials in structured entries:** None recorded. **Dataset quantities:** None recorded. **Contents:** 0 datasets; 0 formulas. Curation notes -------------- A letter to the editor \(Phys\. Rev\. 43, 837 \(1933\), dated May 3, 1933\), one page; the library's page begins with Coates's letter on x\-rays from mercury ions, which is unrelated, and the text columns are interleaved in the library's Markdown \(read in order\: '\.\.\. The Q\-branches are strong and the relative intensity of their lines is being investigated\. \.\.\.'\)\. Identity VALIDATED\_WITH\_WARNINGS \(DOI 10\.1103/PhysRev\.43\.837\.2\); first page checked\. What the letter states about D2 \(TC\-105\)\: 'In all cases the transitions involving even rotational levels are more intense than those involving the odd\. This shows at once that the spin of H2 \[the deuteron\] is neither zero, 1/2 nor 3/2\. It may be stated without reasonable doubt that this spin is 2/2, or twice the spin of H1\.' No intensity ratio is printed\: the letter gives the even\-J\-stronger alternation and the spin 1, qualitatively\. It is the first of the three\: murphy\_1934 measures the ratio \(1\.97 \+\- 0\.03 \: 1\), farkas\_1934 prints the weights \(t \+ 1\)\(2t \+ 1\) and t\(2t \+ 1\), i\.e\. 6 and 3, and cites this letter for the alternation\. No refractive data\: no datasets\. **Recorded bibliographic identity status:** VALIDATED\_WITH\_WARNINGS. This concerns identification of the source; it does not establish the scientific correctness of its contents. Datasets -------- No datasets are recorded. Formulas -------- No formulas are recorded. Corrections ----------- No dataset errata are recorded in this source record. Formula corrections, where recorded, appear with their formulas above. Curation notes may also discuss corrections or unresolved interpretation. Consult the :doc:`review register ` for the checks and decisions.