摘要:

In a discharge in helium with a trace of boron trichloride a new band system is found. The observation of isotope bands and in particular of an intensity alternation in the fine structure shows that the system is due to the diatomic boron molecule, B2. The B211band heads are represented by the formulaThe bands consist of singleRandPbranches. The fine structure analysis yields the following rotational constants:Be′ = 1.160,Be″ = 1.212, α′ = 0.011 and α″ = 0.014 cm.−1. From these the internuclear distancesre′ = 1.625 andre″ = 1.590Å are obtained. It is shown that in all probability the system represents a3Σu− − 3Σ0−transition, the lower state being the ground state.From the intensity alternation in the B211bands, the spin of the B11nuclei is found to be 5/2. This value is in disagreement with recent theoretical predictions based on the Hartree as well as on the α-particle model of the nucleus.Finally, a comparison with the other homonuclear diatomic molecules of the second period of the periodic system is made as well as a comparison of B2and C2with B2H6and C2H6.

ISSN:1923-4287    

DOI:10.1139/cjr40a-016

出版商:NRC Research Press    

年代:1940

数据来源: NRC

摘要:

The paper is a description of a new form of pole piece devised for the electron microscope developed at the University of Toronto.

ISSN:1923-4287    

DOI:10.1139/cjr40a-017

出版商:NRC Research Press    

年代:1940

数据来源: NRC