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Solid-state spectroradiometer for ecological studies in the 1.5-MM transparency window of the atmosphere

✍ Scribed by S. É. Priver; L. I. Fedoseev; A. A. Shvetsov


Book ID
106511755
Publisher
Springer US
Year
2006
Tongue
English
Weight
134 KB
Volume
49
Category
Article
ISSN
0033-8443

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1H solid-state NMR studies of the geomet
✍ Michael Hunger; Dieter Freude; Dieter Fenzke; Harry Pfeifer 📂 Article 📅 1992 🏛 Elsevier Science 🌐 English ⚖ 419 KB

Broad-line 'H NMR and 'H MAS NMR were used to determine the geometry of the Bransted acidic sites in zeolites H-ZSM-5. The signals obtained correspond to bridging hydroxyl groups in Si-OH-Al arrangements with an H-Al distance of 0.246-0.252 nm. The concentration of hypothetical SiOHSi groups must be