A5051143575- Atmospheric Ozone and Climate
- Atmospheric aerosols and clouds
- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Calibration and Measurement Techniques
- Quantum Information and Cryptography
- Quantum optics and atomic interactions
- Cold Atom Physics and Bose-Einstein Condensates
- Remote Sensing in Agriculture
- Air Quality Monitoring and Forecasting
- Impact of Light on Environment and Health
- Solar Radiation and Photovoltaics
- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- earthquake and tectonic studies
- Quantum Mechanics and Applications
- Geophysics and Gravity Measurements
- Atomic and Subatomic Physics Research
- Methane Hydrates and Related Phenomena
- Earthquake Detection and Analysis
- Advanced Frequency and Time Standards
- Mechanical and Optical Resonators
- Quantum many-body systems
- Chalcogenide Semiconductor Thin Films
- Electrochemical Analysis and Applications
Innsbruck Medical University
2012-2025
Universität Innsbruck
2002-2024
Waldrappteam
2017-2021
University of California, Berkeley
2010-2011
Leibniz Institute of Surface Engineering
2001
Advanced inversion Multi-term approach utilizing multiple a priori constraints is proposed. The used as base for the first unified algorithm GRASP that applicable to diverse remote sensing observations and retrieving variety of atmospheric properties. utilization demonstrated.
Abstract The Aerosol, Clouds and Trace Gases Research Infrastructure (ACTRIS) officially became the 33rd European Consortium (ERIC) on 25 April 2023 with support of 17 founding member observer countries. As a pan-European legal organization, ACTRIS ERIC will coordinate provision data products short-lived atmospheric constituents clouds relevant to climate air pollution over next 15–20 years. was designed more than decade ago, its development funded at national levels. It included in Strategy...
The quadrupole S$_{1/2}$ -- D$_{5/2}$ optical transition of a single trapped Ca$^+$ ion, well suited for encoding quantum bit information, is coherently coupled to the standing wave field high finesse cavity. coupling verified by observing ion's response both spatial and temporal variations intracavity field. We also achieve deterministic cavity mode vibrational state selectively exciting state-changing transitions controlling position ion in with nanometer-precision.
Two-level ionic systems, where quantum information is encoded in long lived states (qubits), are discussed extensively for processing. We present a collection of measurements which characterize the stability qubit based on $S_{1/2}$--$D_{5/2}$ transition single $^{40}$Ca$^+$ ions linear Paul trap. find coherence times $\simeq$1 ms, discuss main technical limitations and outline possible improvements.
We show that a chain of trapped ions embedded in microtraps generated by an optical lattice can be used to study oscillator models related dry friction and energy transport. Numerical calculations with realistic experimental parameters demonstrate both static dynamic properties the ion change significantly as power is varied. Finally, we lay out scheme use spin degree freedom probe phase space structure quantum critical behavior chain.
We report measurements of the lifetimes $3d\phantom{\rule{0.3em}{0ex}}^{2}D_{5∕2}$ and $3d\phantom{\rule{0.3em}{0ex}}^{2}D_{3∕2}$ metastable states a single laser-cooled $^{40}\mathrm{Ca}^{+}$ ion in linear Paul trap. introduce measurement technique based on high-efficiency quantum state detection after coherent excitation to ${D}_{5∕2}$ or incoherent shelving ${D}_{3∕2}$ state, subsequent free, unperturbed spontaneous decay. The result for natural lifetime 1168(9) ms agrees excellently with...
A simple and inexpensive fully automated all-sky imaging system based on a commercial digital camera with fish-eye lens rotating polarizer is presented. The characterized two examples of applications in atmospheric physics are given: polarization maps cloud detection. All-sky obtained by acquiring images at different angles computing Stokes vectors. the principal plane, vertical cut through sky containing Sun, compared to measurements well-characterized spectroradiometer polarized radiance...
Abstract The Innsbruck Atmospheric Observatory (IAO) aims to investigate atmospheric chemistry, micrometeorology, and mountain meteorology in a synergistic fashion within an urban setting. A new measurement supersite has been established order study processes affecting the exchange of momentum, energy, trace gases, aerosols Alpine environment. Various long-term continuous measurements are augmented by frequent focused research campaigns with state-of-the-art instrumentation, linking...
This study introduces a new method for nowcasting UV Index maps developed within the framework of Austrian Solar Measurement Network. While we focus on DACH region (Germany, Austria, and Switzerland) in this study, same methods are routinely applied to nowcast Europe. The primary objective is improve public health measures by providing timely area-wide values. based clear-sky calculations using data from Copernicus Atmosphere Monitoring Service. Cloud effects integrated cloud modification...
Trace gasses (e.g., NO2, SO2, HCHO) and aerosols play an important role in atmospheric chemistry physics. They also negatively affect human ecosystem health. Vertical distribution of these the lower troposphere (up to 3-4 km) is often monitored using MAX-DOAS (Multi-AXis Differential Optical Absorption Spectroscopy) technique. Conversion trace gas slant absorption (from different viewing angles) into vertical concentration profile requires information about aerosol optical properties their...
Abstract. This study introduces an Earth observation (EO)-based system which is capable of operationally estimating and continuously monitoring the ultraviolet index (UVI) in Europe. UVIOS (i.e., UV-Index Operating System) exploits a synergy radiative transfer models with high-performance computing EO data from satellites (Meteosat Second Generation Meteorological Operational Satellite-B) retrieval processes (Tropospheric Emission Monitoring Internet Service, Copernicus Atmosphere Service...
We investigate the spontaneous emission lifetime of a single trapped $^{40}\mathrm{Ca}^{+}$ ion placed at different positions in vacuum standing wave inside high finesse cavity which is stabilized to atomic transition. The measured by quantum state detection after $\ensuremath{\pi}$-pulse excitation. result for natural ${D}_{5/2}$ metastable 1161(22) ms agrees, within 1 standard deviation, with most precise published value. observe reduction $\ensuremath{\approx}15%$ node field.
Abstract. A measurement campaign was performed in the region of Vienna and its surroundings from May to July 2007. Within scope this erythemal UV measured at six ground stations within a radius 30 km. First, homogeneity levels area one satellite pixel studied. Second, compared retrieved by ozone monitoring instrument (OMI) onboard NASA EOS Aura Spacecraft. During clear-sky conditions mean bias between different uncertainty ±5%. Short term fluctuations were below 3% 20 For partly cloudy...
A stray light matrix correction method for array spectrometers is presented that specifically tailored solar spectral measurements. distribution function based on a single laser line measurement approximated by an analytical using three parameters only. This the basis matrix. One cutoff filter then used to adjust offset parameter such corrected data are spectrally flat and around zero below wavelength. also accounts IR contribution has be adjusted individually each type of spectrum. solid...
Abstract. We present a unique case study of the solar global irradiance in highly heterogeneous albedo environment at Arctic coast. Diodearray spectroradiometers were deployed three sites around Ny Ålesund, Svalbard, and spectral irradiances simultaneously measured under clear-sky conditions during 24 h period. The 3-D radiative transfer model MYSTIC is applied to simulate measurements various scenarios. First, we effective albedos ocean snow consequently each measurement site. 340 nm...
All-sky distributions of the polarized radiance are measured using an automated fish-eye camera system with a rotating polarizer. For large range aerosol and surface albedo situations, influence on degree polarization sky is investigated. The optical depth 0.05-0.5 0.1-0.75, respectively. this parameters, reduction from about 0.7 to 0.4 was observed. analysis done for 90° scattering angle in principal plane under clear conditions broadband channel 450 ± 25 nm solar zenith angles between 55°...
Abstract. A study for the comprehensive information of current UV exposure area Germany, based on method near real time calculation Index maps used in framework Austrian Monitoring Network, is presented. For Germany about 22.000 surface were calculated year 2022 via radiative transfer model libRadtran by incorporating daily forecast data ozone, albedo and aerosols from Copernicus Atmospheric Service taking into account cloud gathered SEVIRI Meteosat Second Generation form a modification...
Abstract. This study presents an extended analysis of aerosol optical depth at 501 nm (AOD) in the Alpine valley Innsbruck, Austria, from 2007 to 2023, and offers a comparative with station Davos, Switzerland. AOD is derived ground-based sunphotometer measurements direct spectral irradiance during daytime. The Davos Station part AErosol Robotic NETwork (AERONET), global network providing high quality, ground based remote sensing data complies relevant requirements. Innsbruck does not belong...
Abstract. This study presents an extended analysis of aerosol optical depth (AOD) at 501 nm in the Alpine valley Innsbruck, Austria, from 2007 to 2023, and offers a comparative with station Davos, Switzerland. AOD is derived ground-based sun photometer measurements direct spectral irradiance during daytime. The Davos Station part AErosol Robotic NETwork (AERONET), global network providing high-quality, remote sensing data, complies relevant requirements. Innsbruck does not belong AERONET,...
Aerosol optical depth (AOD) is measured with a Precision Filter Radiometer in Innsbruck, Austria, from 2007 to 2011. The 5‐year time series analyzed respect the Ångström parameter α and quadratic coefficient γ . Information on aerosol size distribution obtained by adopting graphical framework showing particle fine mode fraction as well effective radius. conditions Innsbruck reveal typical midlatitudinal pattern for continental urban sites low pollution. Small particles originating traffic...
The anisotropic optical constants of slightly In-rich CuInSe2 are determined on the (112) surface a naturally grown single-crystal sample with orientation domains using generalized spectroscopic ellipsometry for photon energies between 0.8 and 4.5 eV. Orientation within sample, revealed by electron diffraction investigation, cause biaxial response surface. dielectric functions extracted at each wavelength rigorously considering roughness effects, improve previous results.
During three field campaigns spectral actinic flux was measured from 290-500 nm under clear sky conditions in Alpine terrain and the associated O3- NO2-photolysis frequencies were calculated measurement products then compared with 1-D- 3-D-model calculations. To do this 3-D-radiative transfer model adapted for calculations mountainous maps of at surface, model, are given. The differences between 3-D- 1-D-model results selected days during shown, together ratios modeled values to...
Several UV data products derived from satellite measurements, 1-D and 3-D radiative transfer modeling are compared with high-quality ground-based measurements. Data include the index, erythemally weighted daily dose spectrally resolved irradiances at 305, 310, 324 380 nm. The study focuses on radiation climate in mountainous terrain under cloud-free conditions. results show, that overall 3-D- 1-D-model agree best measurements (average ratio 1.10 1.13, range 0.88-1.6). It is also found snow...
Abstract. In this study, we investigate the method of polarized all-sky imaging with respect to aerosol characterization. As a technical frame work for image processing and analysis, propose Zernike polynomials decompose relative Stokes parameter distributions. This defines suitable efficient feature vector which is also appealing because it independent calibration, circumvents overexposure problems robust against pixel noise. We model radiances realistic scenarios construct space key types...