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  1. Article ; Online: X

    Bregnhøj, Mikkel / McLoughlin, Ciaran K / Breitenbach, Thomas / Ogilby, Peter R

    The journal of physical chemistry. A

    2022  Volume 126, Issue 23, Page(s) 3839–3845

    Abstract: Spectra and absorption coefficients of the forbidden 765 nm ... ...

    Abstract Spectra and absorption coefficients of the forbidden 765 nm X
    Language English
    Publishing date 2022-06-01
    Publishing country United States
    Document type Journal Article
    ISSN 1520-5215
    ISSN (online) 1520-5215
    DOI 10.1021/acs.jpca.2c03053
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Two-Photon Excitation of Neat Aerated Solvents with Visible Light Produces Singlet Oxygen.

    Bregnhøj, Mikkel / Ogilby, Peter R

    The journal of physical chemistry. A

    2019  Volume 123, Issue 35, Page(s) 7567–7575

    Abstract: Aeration of common liquid solvents (e.g., cyclohexane, benzene, or water) gives rise to a unique absorption band associated with a transition from a ground state oxygen-solvent collision complex to an oxygen-solvent charge-transfer (CT) state. Although ... ...

    Abstract Aeration of common liquid solvents (e.g., cyclohexane, benzene, or water) gives rise to a unique absorption band associated with a transition from a ground state oxygen-solvent collision complex to an oxygen-solvent charge-transfer (CT) state. Although the absorption band is solvent-dependent, the energies involved invariably correspond to a one-photon transition in UV. We now show that this CT state can also be produced in a nonlinear two-photon process using visible light. Moreover, the CT state decays to produce an appreciable amount of singlet oxygen, O
    Language English
    Publishing date 2019-08-23
    Publishing country United States
    Document type Journal Article
    ISSN 1520-5215
    ISSN (online) 1520-5215
    DOI 10.1021/acs.jpca.9b05517
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Spore Survival During Abrasive Saltation on Mars: A Reply to the Comment by Minns

    Bak, Ebbe Norskov / Bregnhøj, Mikkel / Nørnberg, Per / Jensen, Svend J Knak / Thøgersen, Jan / Finster, Kai

    Astrobiology

    2022  Volume 22, Issue 9, Page(s) 1032–1033

    MeSH term(s) Exobiology ; Mars ; Spores, Bacterial
    Language English
    Publishing date 2022-08-10
    Publishing country United States
    Document type News ; Comment
    ZDB-ID 2047736-3
    ISSN 1557-8070 ; 1531-1074
    ISSN (online) 1557-8070
    ISSN 1531-1074
    DOI 10.1089/ast.2022.0085
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: The primary photo-dissociation dynamics of lactate in aqueous solution: decarboxylation prevents dehydroxylation.

    Thøgersen, Jan / Vaida, Veronica / Bregnhøj, Mikkel / Weidner, Tobias / Jensen, Frank

    Physical chemistry chemical physics : PCCP

    2021  Volume 23, Issue 8, Page(s) 4555–4568

    Abstract: We study the primary photolysis dynamics of aqueous lactate induced by photo-excitation at λ = 200 nm. Our calculations indicate that both decarboxylation and dehydroxylation are energetically possible, but decarboxylation is favoured dynamically. UV ... ...

    Abstract We study the primary photolysis dynamics of aqueous lactate induced by photo-excitation at λ = 200 nm. Our calculations indicate that both decarboxylation and dehydroxylation are energetically possible, but decarboxylation is favoured dynamically. UV pump - IR probe transient absorption spectroscopy shows that the photolysis is dominated by decarboxylation, whereas dehydroxylation is not observed. Analysis of the transient IR spectrum suggests that photo-dissociation of lactate primarily produces CO
    Language English
    Publishing date 2021-02-19
    Publishing country England
    Document type Journal Article
    ZDB-ID 1476244-4
    ISSN 1463-9084 ; 1463-9076
    ISSN (online) 1463-9084
    ISSN 1463-9076
    DOI 10.1039/d0cp05650b
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: A liquid surface height controller for surface spectroscopy.

    Pickering, James D / Chatterley, Adam S / Bregnhøj, Mikkel / Weidner, Tobias

    The Review of scientific instruments

    2021  Volume 92, Issue 9, Page(s) 94104

    Abstract: We present a simple and inexpensive liquid surface height controller that can monitor and maintain the height of a liquid surface in a surface-sensitive experiment. The system is based on a commercial laser pointer, universal serial bus webcam, syringe ... ...

    Abstract We present a simple and inexpensive liquid surface height controller that can monitor and maintain the height of a liquid surface in a surface-sensitive experiment. The system is based on a commercial laser pointer, universal serial bus webcam, syringe pump, and homemade control software. The system can sense changes in the height of the surface of ±1 µm, and the maximum range of the device without readjustment is around 2.5 mm. The intended use of the device is to maintain the height of a sample at the air-water interface in a sum-frequency generation spectroscopy measurement, which constantly changes due to water evaporation. A demonstration of the system maintaining the height of a water surface to a tolerance of ±5 µm over a period of 8 h is shown to illustrate the stability of a system controlled by this device.
    Language English
    Publishing date 2021-10-01
    Publishing country United States
    Document type Journal Article
    ZDB-ID 209865-9
    ISSN 1089-7623 ; 0034-6748
    ISSN (online) 1089-7623
    ISSN 0034-6748
    DOI 10.1063/5.0057849
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Tutorials in vibrational sum frequency generation spectroscopy. III. Collecting, processing, and analyzing vibrational sum frequency generation spectra.

    Pickering, James D / Bregnhøj, Mikkel / Rasmussen, Mette H / Strunge, Kris / Weidner, Tobias

    Biointerphases

    2022  Volume 17, Issue 4, Page(s) 41201

    Abstract: In this Tutorial series, we aim to provide an accessible introduction to vibrational sum frequency generation (VSFG) spectroscopy, targeted toward people entering the VSFG world without a rigorous formal background in optical physics or nonlinear ... ...

    Abstract In this Tutorial series, we aim to provide an accessible introduction to vibrational sum frequency generation (VSFG) spectroscopy, targeted toward people entering the VSFG world without a rigorous formal background in optical physics or nonlinear spectroscopy. In this article, we discuss in detail the processes of collecting and processing VSFG data, and user-friendly processing software (sfgtools) is provided for use by people new to the field. Some discussion of analyzing VSFG spectra is also given, specifically with a discussion of fitting homodyne VSFG spectra, and a discussion of what can be learned (both qualitatively and quantitatively) from VSFG spectra.
    MeSH term(s) Humans ; Spectrum Analysis/methods ; Surface Properties ; Vibration
    Language English
    Publishing date 2022-08-05
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2234510-3
    ISSN 1559-4106 ; 1934-8630
    ISSN (online) 1559-4106
    ISSN 1934-8630
    DOI 10.1116/6.0001951
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Tutorials in vibrational sum frequency generation spectroscopy. I. The foundations.

    Pickering, James D / Bregnhøj, Mikkel / Chatterley, Adam S / Rasmussen, Mette H / Strunge, Kris / Weidner, Tobias

    Biointerphases

    2022  Volume 17, Issue 1, Page(s) 11201

    Abstract: Interfaces between bulk media are often where critical molecular processes occur that can dictate the chemistry of an entire macroscopic system. Optical spectroscopy such as IR or Raman spectroscopy is often challenging to apply to interfaces due to ... ...

    Abstract Interfaces between bulk media are often where critical molecular processes occur that can dictate the chemistry of an entire macroscopic system. Optical spectroscopy such as IR or Raman spectroscopy is often challenging to apply to interfaces due to contributions from bulk phases that dominate the spectra, masking any detail about the interfacial layer. Vibrational sum frequency generation (VSFG) spectroscopy is a nonlinear spectroscopy that allows vibrational spectra of molecules at interfaces to be directly measured. This Tutorial series is aimed at people entering the VSFG world without a rigorous formal background in optical physics or nonlinear spectroscopy. In this article, we present the fundamental theory of VSFG spectroscopy, with a focus on qualitative, intuitive explanation of the relevant physical phenomena, with minimal mathematics, to enable a newcomer to VSFG spectroscopy to quickly become conversant in the language and fundamental physics of the technique.
    MeSH term(s) Humans ; Spectrum Analysis, Raman ; Surface Properties ; Vibration ; Water/chemistry
    Chemical Substances Water (059QF0KO0R)
    Language English
    Publishing date 2022-01-20
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2234510-3
    ISSN 1559-4106 ; 1934-8630
    ISSN (online) 1559-4106
    ISSN 1934-8630
    DOI 10.1116/6.0001401
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: The Diatom Peptide R5 Fabricates Two-Dimensional Titanium Dioxide Nanosheets.

    Bregnhøj, Mikkel / Lutz, Helmut / Roeters, Steven J / Lieberwirth, Ingo / Mertig, Rolf / Weidner, Tobias

    The journal of physical chemistry letters

    2022  Volume 13, Issue 22, Page(s) 5025–5029

    Abstract: Diatoms use peptides based on the protein silaffin to fabricate their silica cell walls. To the interest of material scientists, silaffin peptides can also produce titanium dioxide nanoparticles. Peptide-based synthesis could present an environmentally ... ...

    Abstract Diatoms use peptides based on the protein silaffin to fabricate their silica cell walls. To the interest of material scientists, silaffin peptides can also produce titanium dioxide nanoparticles. Peptide-based synthesis could present an environmentally friendly route to the synthesis of titanium dioxide nanomaterials with potential applications in water splitting and for biocompatible materials design. Two-dimensional nanomaterials have exceptional surface-to-volume ratios and are particularly suited for these applications. We here demonstrate how the silaffin peptide R5 can precipitate free-standing and self-supported sheets of titanium dioxide at the air-water interface, which are stable over tens of micrometers.
    MeSH term(s) Diatoms/metabolism ; Peptides ; Silicon Dioxide/metabolism ; Titanium ; Water
    Chemical Substances Peptides ; Water (059QF0KO0R) ; titanium dioxide (15FIX9V2JP) ; Silicon Dioxide (7631-86-9) ; Titanium (D1JT611TNE)
    Language English
    Publishing date 2022-06-02
    Publishing country United States
    Document type Journal Article
    ISSN 1948-7185
    ISSN (online) 1948-7185
    DOI 10.1021/acs.jpclett.2c01088
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: Structure and Orientation of the SARS-Coronavirus-2 Spike Protein at Air–Water Interfaces

    Bregnhøj, Mikkel / Roeters, Steven J. / Chatterley, Adam S. / Madzharova, Fani / Mertig, Rolf / Pedersen, Jan Skov / Weidner, Tobias

    Journal of physical chemistry. 2022 Apr. 28, v. 126, no. 18

    2022  

    Abstract: The SARS coronavirus 2 (SARS-CoV-2) spike protein is located at the outermost perimeter of the viral envelope and is the first component of the virus to make contact with surrounding interfaces. The stability of the spike protein when in contact with ... ...

    Abstract The SARS coronavirus 2 (SARS-CoV-2) spike protein is located at the outermost perimeter of the viral envelope and is the first component of the virus to make contact with surrounding interfaces. The stability of the spike protein when in contact with surfaces plays a deciding role for infection pathways and for the viability of the virus after surface contact. While cryo-EM structures of the spike protein have been solved with high resolution and structural studies in solution have provided information about the secondary and tertiary structures, only little is known about the folding when adsorbed to surfaces. We here report on the secondary structure and orientation of the S1 segment of the spike protein, which is often used as a model protein for in vitro studies of SARS-CoV-2, at the air–water interface using surface-sensitive vibrational sum-frequency generation (SFG) spectroscopy. The air–water interface plays an important role for SARS-CoV-2 when suspended in aerosol droplets, and it serves as a model system for hydrophobic surfaces in general. The SFG experiments show that the S1 segment of the spike protein remains folded at the air–water interface and predominantly binds in its monomeric state, while the combination of small-angle X-ray scattering and two-dimensional infrared spectroscopy measurements indicate that it forms hexamers with the same secondary structure in aqueous solution.
    Keywords Severe acute respiratory syndrome coronavirus 2 ; aerosols ; aqueous solutions ; hydrophobicity ; infrared spectroscopy ; liquid-air interface ; small-angle X-ray scattering ; viability ; viruses
    Language English
    Dates of publication 2022-0428
    Size p. 3425-3430.
    Publishing place American Chemical Society
    Document type Article
    ISSN 1520-5207
    DOI 10.1021/acs.jpcb.2c01272
    Database NAL-Catalogue (AGRICOLA)

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  10. Article ; Online: Tutorials in vibrational sum frequency generation spectroscopy. II. Designing a broadband vibrational sum frequency generation spectrometer.

    Pickering, James D / Bregnhøj, Mikkel / Chatterley, Adam S / Rasmussen, Mette H / Roeters, Steven J / Strunge, Kris / Weidner, Tobias

    Biointerphases

    2022  Volume 17, Issue 1, Page(s) 11202

    Abstract: In this Tutorial series, we aim to provide an accessible introduction to vibrational sum frequency generation (VSFG) spectroscopy, targeted toward people entering the VSFG world without a rigorous formal background in optical physics or nonlinear ... ...

    Abstract In this Tutorial series, we aim to provide an accessible introduction to vibrational sum frequency generation (VSFG) spectroscopy, targeted toward people entering the VSFG world without a rigorous formal background in optical physics or nonlinear spectroscopy. In this article, we describe in depth how a broadband VSFG spectrometer is designed and constructed, using the instrument in SurfLab, Aarhus University, as an illustrative case. Detailed information about specific instrumentation (together with reasons why things are the way they are) is given throughout. This information is often omitted in other descriptions of such instrumentation and so will be invaluable to people new to the field.
    MeSH term(s) Humans ; Spectrum Analysis/methods ; Surface Properties ; Vibration
    Language English
    Publishing date 2022-01-20
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2234510-3
    ISSN 1559-4106 ; 1934-8630
    ISSN (online) 1559-4106
    ISSN 1934-8630
    DOI 10.1116/6.0001403
    Database MEDical Literature Analysis and Retrieval System OnLINE

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