The Experts below are selected from a list of 150840 Experts worldwide ranked by ideXlab platform
M Evans - One of the best experts on this subject based on the ideXlab platform.
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audio band coating thermal noise measurement for advanced ligo with a multimode optical resonator
Physical Review D, 2017Co-Authors: Sebastien Gras, Denis Martynov, Hang Yu, M EvansAbstract:In modern high precision optical instruments, such as in gravitational wave detectors or frequency references, thermally induced fluctuations in the reflective coatings can be a limiting noise source. This noise, known as coating thermal noise, can be reduced by choosing materials with low mechanical loss. Examination of new materials becomes a necessity in order to further minimize the coating thermal noise and thus improve sensitivity of next generation instruments. We present a novel approach to directly measure coating thermal noise using a high finesse folded cavity in which multiple Hermite-Gaussian modes co-resonate. This method is used to Probe Surface fluctuations on the order 10^-17 m\rtHz in the frequency range 30-400 Hz. We applied this technique to measure thermal noise and loss angle of the coating used in Advanced LIGO.
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audio band coating thermal noise measurement for advanced ligo with a multimode optical resonator
Physical Review D, 2017Co-Authors: Sebastien Gras, W Yam, D V Martynov, M EvansAbstract:In modern high precision optical instruments, such as in gravitational wave detectors or frequency references, thermally induced fluctuations in the reflective coatings can be a limiting noise source. This noise, known as coating thermal noise, can be reduced by choosing materials with low mechanical loss. Examination of new materials becomes a necessity in order to further minimize the coating thermal noise and thus improve sensitivity of next generation instruments. We present a novel approach to directly measure coating thermal noise using a high finesse folded cavity in which multiple Hermite-Gaussian modes coresonate. This method is used to Probe Surface fluctuations on the order ${10}^{\ensuremath{-}17}\text{ }\text{ }\mathrm{m}/\sqrt{\mathrm{Hz}}$ in the frequency range 30--400 Hz. We applied this technique to measure thermal noise and loss angle of the coating used in Advanced LIGO.
Sebastien Gras - One of the best experts on this subject based on the ideXlab platform.
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audio band coating thermal noise measurement for advanced ligo with a multimode optical resonator
Physical Review D, 2017Co-Authors: Sebastien Gras, Denis Martynov, Hang Yu, M EvansAbstract:In modern high precision optical instruments, such as in gravitational wave detectors or frequency references, thermally induced fluctuations in the reflective coatings can be a limiting noise source. This noise, known as coating thermal noise, can be reduced by choosing materials with low mechanical loss. Examination of new materials becomes a necessity in order to further minimize the coating thermal noise and thus improve sensitivity of next generation instruments. We present a novel approach to directly measure coating thermal noise using a high finesse folded cavity in which multiple Hermite-Gaussian modes co-resonate. This method is used to Probe Surface fluctuations on the order 10^-17 m\rtHz in the frequency range 30-400 Hz. We applied this technique to measure thermal noise and loss angle of the coating used in Advanced LIGO.
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audio band coating thermal noise measurement for advanced ligo with a multimode optical resonator
Physical Review D, 2017Co-Authors: Sebastien Gras, W Yam, D V Martynov, M EvansAbstract:In modern high precision optical instruments, such as in gravitational wave detectors or frequency references, thermally induced fluctuations in the reflective coatings can be a limiting noise source. This noise, known as coating thermal noise, can be reduced by choosing materials with low mechanical loss. Examination of new materials becomes a necessity in order to further minimize the coating thermal noise and thus improve sensitivity of next generation instruments. We present a novel approach to directly measure coating thermal noise using a high finesse folded cavity in which multiple Hermite-Gaussian modes coresonate. This method is used to Probe Surface fluctuations on the order ${10}^{\ensuremath{-}17}\text{ }\text{ }\mathrm{m}/\sqrt{\mathrm{Hz}}$ in the frequency range 30--400 Hz. We applied this technique to measure thermal noise and loss angle of the coating used in Advanced LIGO.
A Bansil - One of the best experts on this subject based on the ideXlab platform.
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ligand Surface interactions and Surface oxidation of colloidal pbse quantum dots revealed by thin film positron annihilation methods
arXiv: Materials Science, 2016Co-Authors: Wenqin Shi, S W H Eijt, C Suchand S Sandeep, Laurens D A Siebbeles, Arjan J Houtepen, Sachin Kinge, E Bruck, Bernardo Barbiellini, A BansilAbstract:Positron Two Dimensional Angular Correlation of Annihilation Radiation (2D-ACAR) measurements reveal modifications of the electronic structure and composition at the Surfaces of PbSe quantum dots (QDs), deposited as thin films, produced by various ligands containing either oxygen or nitrogen atoms. In particular, the 2D-ACAR measurements on thin films of colloidal PbSe QDs capped with oleic acid ligands yield an increased intensity in the electron momentum density (EMD) at high momenta compared to PbSe quantum dots capped with oleylamine. Moreover, the EMD of PbSe QDs is strongly affected by the small ethylediamine ligands, since these molecules lead to small distances between QDs and favor neck formation between near neighbor QDs, inducing electronic coupling between neighboring QDs. The high sensitivity to the presence of oxygen atoms at the Surface can be also exploited to monitor the Surface oxidation of PbSe QDs upon exposure to air. Our study clearly demonstrates that positron annihilation spectroscopy applied to thin films can Probe Surface transformations of colloidal semiconductor QDs embedded in functional layers.
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ligand Surface interactions and Surface oxidation of colloidal pbse quantum dots revealed by thin film positron annihilation methods
Applied Physics Letters, 2016Co-Authors: Wenqin Shi, S W H Eijt, C Suchand S Sandeep, Laurens D A Siebbeles, Arjan J Houtepen, Sachin Kinge, E Bruck, Bernardo Barbiellini, A BansilAbstract:Positron Two Dimensional Angular Correlation of Annihilation Radiation (2D-ACAR) measurements reveal modifications of the electronic structure and composition at the Surfaces of PbSequantum dots(QDs),deposited as thin films, produced by various ligands containing either oxygen or nitrogen atoms. In particular, the 2D-ACAR measurements on thin films of colloidalPbSeQDs capped with oleic acid ligands yield an increased intensity in the electron momentum density (EMD) at high momenta compared to PbSequantum dots capped with oleylamine. Moreover, the EMD of PbSeQDs is strongly affected by the small ethylenediamine ligands, since these molecules lead to small distances between QDs and favor neck formation between near neighbor QDs, inducing electronic coupling between neighboring QDs. The high sensitivity to the presence of oxygen atoms at the Surface can be also exploited to monitor the Surface oxidation of PbSeQDs upon exposure to air. Our study clearly demonstrates that positron annihilation spectroscopy applied to thin films can Probe Surface transformations of colloidal semiconductor QDs embedded in functional layers.
Ole Norregaard Jensen - One of the best experts on this subject based on the ideXlab platform.
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simplified sample preparation method for protein identification by matrix assisted laser desorption ionization mass spectrometry in gel digestion on the Probe Surface
Proteomics, 2001Co-Authors: Allan Stensballe, Ole Norregaard JensenAbstract:Identification and detailed characterization of complex mixtures of proteins separated by polyacrylamide gel electrophoresis (PAGE) require optimized and robust methods for interfacing electrophoretic techniques to mass spectrometry. Peptide mapping by matrix-assisted laser desorption/ionization-time of flight mass spectrometry (MALDI-TOF-MS) is used as the first protein screening method in many laboratories because of its inherent simplicity, mass accuracy, sensitivity and relatively high sample throughput. We present a simplified sample preparation method for MALDI-MS that enables in-gel digestion of protein samples directly on the MALDI-MS metal Probe. Removal of detergent and reagents as well as protein reduction and S-alkylation were performed prior to cutting of protein samples from the polyacrylamide gel slab. The general utility of this approach was demonstrated by on-Probe digestion and MALDI-MS peptide mapping of femtomole amounts of standard proteins isolated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. A representative set of 47 human proteins obtained from a silver stained two-dimensional electrophoretic gel was analyzed by the new method and resulted in a success rate for protein identification similar to that obtained by the traditional protocols for in-gel digestion and MALDI peptide mass mapping of human proteins, i.e. approximately 60%. The overall performance of the novel on-Probe digestion method is comparable with that of the standard in-gel sample preparation protocol while being less labour intensive and more cost-effective due to minimal consumption of reagents, enzymes and consumables. Preliminary data obtained on a MALDI quadrupole-TOF tandem mass spectrometer demonstrated the utility of the on-Probe digestion protocol for peptide mass mapping and peptide sequencing on this instrument. Automation of the on-Probe protein digestion procedure and its combination with automated MALDI tandem mass spectrometry should be advantageous in proteomics research aimed at the systematic identification and analysis of large sets of proteins from electrophoretic gels.
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simplified sample preparation method for protein identification by matrix assisted laser desorption ionization mass spectrometry in gel digestion on the Probe Surface
European Journal of Mass Spectrometry, 2001Co-Authors: Allan Stensballe, Ole Norregaard JensenAbstract:Identification and detailed characterization of complex mixtures of proteins separated by polyacrylamide gel electrophoresis (PAGE) require optimized and robust methods for interfacing electrophoretic techniques to mass spectrometry. Peptide mapping by matrix-assisted laser desorption/ionization (MALDI) time-of-flight mass spectrometry (TOF MS) is used as the first protein screening method in many laboratories because of its inherent simplicity, mass accuracy, sensitivity and relatively high sample throughput. We present a simplified sample preparation method for MALDI MS that enables in-gel digestion of protein samples directly on the MALDI MS metal Probe. Removal of detergent and reagents as well as protein reduction and S-alkylation were performed prior to cutting of protein samples from the polyacrylamide gel slab. The general utility of this approach was demonstrated by on-Probe digestion and MALDI MS peptide mapping of femtomole amounts of standard proteins isolated by sodium dodecyl sulfate (SDS) P...
Wenqin Shi - One of the best experts on this subject based on the ideXlab platform.
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ligand Surface interactions and Surface oxidation of colloidal pbse quantum dots revealed by thin film positron annihilation methods
arXiv: Materials Science, 2016Co-Authors: Wenqin Shi, S W H Eijt, C Suchand S Sandeep, Laurens D A Siebbeles, Arjan J Houtepen, Sachin Kinge, E Bruck, Bernardo Barbiellini, A BansilAbstract:Positron Two Dimensional Angular Correlation of Annihilation Radiation (2D-ACAR) measurements reveal modifications of the electronic structure and composition at the Surfaces of PbSe quantum dots (QDs), deposited as thin films, produced by various ligands containing either oxygen or nitrogen atoms. In particular, the 2D-ACAR measurements on thin films of colloidal PbSe QDs capped with oleic acid ligands yield an increased intensity in the electron momentum density (EMD) at high momenta compared to PbSe quantum dots capped with oleylamine. Moreover, the EMD of PbSe QDs is strongly affected by the small ethylediamine ligands, since these molecules lead to small distances between QDs and favor neck formation between near neighbor QDs, inducing electronic coupling between neighboring QDs. The high sensitivity to the presence of oxygen atoms at the Surface can be also exploited to monitor the Surface oxidation of PbSe QDs upon exposure to air. Our study clearly demonstrates that positron annihilation spectroscopy applied to thin films can Probe Surface transformations of colloidal semiconductor QDs embedded in functional layers.
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ligand Surface interactions and Surface oxidation of colloidal pbse quantum dots revealed by thin film positron annihilation methods
Applied Physics Letters, 2016Co-Authors: Wenqin Shi, S W H Eijt, C Suchand S Sandeep, Laurens D A Siebbeles, Arjan J Houtepen, Sachin Kinge, E Bruck, Bernardo Barbiellini, A BansilAbstract:Positron Two Dimensional Angular Correlation of Annihilation Radiation (2D-ACAR) measurements reveal modifications of the electronic structure and composition at the Surfaces of PbSequantum dots(QDs),deposited as thin films, produced by various ligands containing either oxygen or nitrogen atoms. In particular, the 2D-ACAR measurements on thin films of colloidalPbSeQDs capped with oleic acid ligands yield an increased intensity in the electron momentum density (EMD) at high momenta compared to PbSequantum dots capped with oleylamine. Moreover, the EMD of PbSeQDs is strongly affected by the small ethylenediamine ligands, since these molecules lead to small distances between QDs and favor neck formation between near neighbor QDs, inducing electronic coupling between neighboring QDs. The high sensitivity to the presence of oxygen atoms at the Surface can be also exploited to monitor the Surface oxidation of PbSeQDs upon exposure to air. Our study clearly demonstrates that positron annihilation spectroscopy applied to thin films can Probe Surface transformations of colloidal semiconductor QDs embedded in functional layers.
