Sökning: "High-resolution spectroscopy"

Visar resultat 26 - 30 av 38 uppsatser innehållade orden High-resolution spectroscopy.

  1. 26. Identification of elements and molecules in the spectra of an M dwarf star using high resolution infrared spectroscopy.

    Kandidat-uppsats, Uppsala universitet/Institutionen för fysik och astronomi

    Författare :Markus Pudas; [2017]
    Nyckelord :M dwarf stars; line list ; spectroscopy ; high resolution infrared; telluric spectra;

    Sammanfattning : M dwarfs are abundant and long-lived stellar objects. The formation of planets around stars in stellar systems is believed to be metallicity dependent. To determine the metallicity with synthetic spectrum analysis, the elements producing the absorption lines ofthe spectra first have to be identified. LÄS MER

  3. 27. Design and Implementation of a 2-Channel High Precision and High Speed Digitizing system

    Master-uppsats, Lunds universitet/Institutionen för elektro- och informationsteknik

    Författare :Albert Llimós Muntal; [2016]
    Nyckelord :Analog; Digital; ADC; Digitizing; data acquisition; two channel; precision; resolution; speed; Technology and Engineering;

    Sammanfattning : Recently, new spectroscopic techniques have been developed such as photocurrent detected two-dimensional spectroscopy [1], which measure the response from a sample that is excited by a high intensity laser pulses. The responses are linear and nonlinear signals that have very different amplitudes; the linear signal can be from 103 to 105 times larger than the nonlinear signal. LÄS MER

  4. 28. Properties of III-V semiconductor materials grown by HVPE

    Master-uppsats, KTH/Skolan för informations- och kommunikationsteknik (ICT)

    Författare :Stamoulis Stergiakis; [2016]
    Nyckelord :;

    Sammanfattning : This thesis focuses on the characterization of lll-V semiconductor materials by using Scanning Electron Microscopy equipped with Energy Dispersive Spectroscopy (SEM-EDS), High Resolution X-ray Diffraction (HRXRD), Atomic Force Microscopy (AFM) and Photoluminescence (PL). In XRD characterization, the rocking curve measurement was conducted to evaluate the composition of III-V semiconductor alloys and the Reciprocal Lattice Mapping (RLM) revealed the detailed structural properties of heteroepitaxial III-V semiconductors. LÄS MER

  5. 29. High resolution imaging of GaAs nanowires

    Kandidat-uppsats, Lunds universitet/Fysiska institutionen; Lunds universitet/Synkrotronljusfysik

    Författare :Andreas Johansson; [2015]
    Nyckelord :Scanning Tunneling Microscopy; STM; Nanowire; Gallium Arsenide; GaAs; Semiconductor; Atomic structure; Morphology; Nanoelectronics; Heterostructure; Physics and Astronomy;

    Sammanfattning : Semiconductor nanowires (NWs) are expected to be the new building blocks in electronics and photonics, but improved understanding of the nanowire surfaces and electronic properties are required to realize it. In this bachelor thesis, wurtzite (Wz)-zincblende (Zb) axial heterostructure GaAs nanowires are studied using scanning tunneling microscopy and spectroscopy. LÄS MER

  7. 30. Scanning probe microscopy with gallium nitride nanowires

    L2-uppsats, Lunds universitet/Fysiska institutionen; Lunds universitet/Fasta tillståndets fysik

    Författare :Victor Ahlinder; [2015]
    Nyckelord :Physics and Astronomy;

    Sammanfattning : In scanning probe microscopy the properties of the tip is crucial in determining which information that can be obtained from the resulting images and spectroscopy. Ordinarily metal tips are used for scanning, however by using semiconducting nanowires as tips one would have very well defined probes with more advanced possibilities for spectroscopic measurements. LÄS MER