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In order to separate the contributions of the copper, titanium, and chalcogen states into the electronic structure of the valence band, photoelectron spectroscopy in nonresonant and resonant (Cu 3p-3d and Ti 2p-3d) excitation modes was used. It is shown that the ionicity of the chemical bond between copper and host lattice is decreased in the TiS2 \u2192 TiSe2 \u2192 TiTe2 row. In CuxTiS2, copper atoms form the chemical bond with TiCh2 host lattice, while in CuxTiTe2 directly with tellurium atoms.<\/jats:p>","DOI":"10.1063\/1.5128299","type":"journal-article","created":{"date-parts":[[2019,12,16]],"date-time":"2019-12-16T15:28:47Z","timestamp":1576510127000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":3,"title":["Chemical bonds in intercalation compounds CuxTiCh2 (Ch = S, Te)"],"prefix":"10.1063","volume":"151","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3774-5669","authenticated-orcid":false,"given":"A. 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