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1	Tuning the Čerenkov second harmonic contrast from ferroelectric domain walls via anomalous dispersion Hegarty, Peter A., Eng, Lukas M., Rüsing, Michael 19 March 2024 (has links) Second harmonic (SH) microscopy represents a powerful tool for the investigation of crystalline systems, such as ferroelectrics and their domain walls (DWs). Under the condition of normal dispersion, i.e., the refractive index at the SH wavelength is larger as compared to the refractive index at the fundamental wavelength, n(2ω) . n(ω), bulk crystals will generate no SH signal. Should the bulk, however, contain DWs, an appreciable SH signal will still be detectable at the location of DWs stemming from the Čerenkov mechanism. In this work, we demonstrate both how SH signals are generated in bulk media and how the Čerenkov mechanism can be inhibited by using anomalous dispersion, i.e., n(ω) . n(2ω). This allows us to quantitatively estimate the relative strength of the Čerenkov compared to other SH contrast mechanisms in DWs, such as the interference contrast. The results are in agreement with previous experiments based on the geometric separation of the signals. Due to the observed, strong Čerenkov contrast, such signal contributions may not be neglected in polarimetry studies of ferroelectric DWs in the future. info:eu-repo/classification/ddc/530 ddc:530
2	Sticky triangles: New tools for experimental phasing of biological macromolecules / Sticky triangles: Neue Werkzeuge für die experimentelle Phasierung von biologischen Makromolekülen Beck, Tobias 16 September 2010 (has links) No description available. 540 Chemie Chemistry Strukturbestimmung Strukturlösung biologische Makromoleküle Proteine experimentelle Phasierung anomale Dispersion Schweratomderivatisierung structure determination structure solution biological macromolecules proteins experimenal phasing anomalous dispersion heavy-atom derivatisation 35.62 35.76 35.90 42.13 SP 000: Strukturchemie SXL 440: Struktur {Biochemie} WF 100: Methoden {Molekularbiologie Gentechnologie}
3	Optimising His-tags for purification and phasing / Optimierte His-tags für Aufreinigung und Phasierung Groβe, Christian 05 October 2010 (has links) No description available. 540 Chemie Chemistry crystal structure peptide his-tag phase problem anomalous dispersion IMAC beta-hairpin Kristallstruktur Peptid His-Tag Phasenproblem anomale Dispersion IMAC beta-Hairpin 35.25 35.62 35 76 SP 000: Strukturchemie SXL 300: Peptide Polypeptide Peptone {Biochemie}

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