An apparatus for high resolution photoelectron spectrometry of negative ions is described. With this machine, energy spectra of electrons detached from OH , SH , and SD-ions by 488.0 nm and 514.5 nm radiation have been measured with a resolution of 5-7 meV. The rotational branches have been clearly resolved and the electron angular distributions have been determined for the different branches. The measured rotational structure has been reproduced in model calculations; for SH-, our results confirm the threshold model of Walker. The following rotational constants for the respective negative ions have been derived: B0(OH-)=18.75(15)c m 1, B0(SH )=9.39(3)cm 1, B0(SD-)=4.87(2)cm-1The electron affinities of SH, SD have been determined to be EA(SH)=2.317(2)eV and E A(SD) = 2.315 (2)eV; the negative ion vibrational frequencies have been found to agree with those in the parent neutrals to within about 100 cm-1
Lee, S.C.J.; Breyer, F.; Randel, S.; Ziemann, O.; van den Boom, H.P.A.; Koonen, A.M.J. Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers.
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The energy spectra of electrons detached from O-and S ions by 488.0nm and 514.5 nm photons have been measured with high electron energy resolution (5 meV) in order to determine the branching ratios for the various 2P3/2.1/2 --" aP2, 1.o fine-structure transitions together with their respective angular distributions. Detailed information on the relative importance of the s-and d-wave continuum is obtained.
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