Anton Serdyukov

Status of the IR and THz beamlines at the Metrology Light Source

The low-energy electron storage ring Metrology Light Source (MLS), a dedicated synchrotron radiation source, is in user operation since April 2008 at operating energies ranging from 105 MeV up to 630 MeV. It provides coherent THz radiation when it is operated in a low alpha mode with short electron bunches. At the MLS, two bending magnet beamlines optimized for the MIR and the THz spectral range are operational. We report the status of these two beamlines and present first results of the IR and THz measurements at the MLS.

IR and THz Beamlines at the Metrology Light Source of the PTB

The low‐energy electron storage ring Metrology Light Source (MLS), a dedicated synchrotron radiation source, is in user operation since April 2008. As a special option it provides coherent synchrotron radiation (CSR) in the THz range when it is operated in a low‐α mode with short electron bunches. At the MLS three beamlines dedicated to the use of IR and THz radiation were designed, built and commissioned.

Spectral reference line data relevant to remote sensing applications: a review and outline of the EUMETRISPEC project

Within the European Metrology Research Programme (EMRP)1 the EUMETRISPEC joint research project was focused on metrological aspects of spectral reference line data2 as presented earlier3. We review EUMETRISPEC’s first funding through the EMRP and the outcome of this metrology effort to support the line data and the atmospheric remote sensing community. We describe current examples from the EMRP project to address present deficiencies of available line data. Key points of this project were the development of an open European hardware infrastructure for traceable spectral reference data and the development of standardized procedures to measure traceable molecular spectral line data. The paper describes the development of a spectroscopy infrastructure based on a Bruker IFS 125 HR high-resolution Fourier- Transform Infrared (FTIR) spectrometer, discusses the achieved results on molecular line parameters (e.g. line strengths and pressure broadening coefficients) of the greenhouse gas species CO2 and CO. Here, metrology aims to provide its additional input in terms of improved quality management, detailed uncertainty assessments and ultimately traceable spectral data linked to the SI units wherever tightened data quality objectives and improved data quality are required for certain remote sensing applications. In this paper we show how metrology efforts support this goal by means of spectroscopy infrastructure. An outline of future activities is given promoting the discussion with the remote sensing community and fostering improved links to the metrology community.

High-resolution Fourier transform measurements of line strengths in the 00 0 2-00 0 0 main isotopologue band of nitrous oxide

Nitrous oxide (N2O) is a key greenhouse gas and a major ozone-depleting anthropogenic pollutant monitored by the total carbon column observing network (TCCON) in the 0002-0000-band of its main isotopologue. Here, we present highly accurate line strengths for this window determined using Fourier transform infrared spectroscopy with pressure, temperature, and optical path length being metrologically traceable to the SI. The obtained results agree with previous studies within the given uncertainties. Depending on the respective rovibrational transition, the present uncertainties could be reduced by a factor of 5 to 83 in comparison to literature data.

First measurements at the new dedicated THz beamline at the MLS

The Physikalisch-Technische Bundesanstalt (PTB), the German national metrology institute, is operating the low-energy electron storage ring Metrology Light Source (MLS) in Berlin-Adlershof in close cooperation with the Helmholtz-Zentrum Berlin (HZB). The MLS is designed and prepared for a low-α machine optics mode based on a sextupole and octupole correction scheme, for the production of coherent synchrotron radiation in the far-IR and THz region. We present first results obtained from the new dedicated THz beamline at MLS.

EUMETRISPEC: A Versatile, Metrological, High-resolution Fouriertransform-spectrometer- Infrastructure to Determine Accurate Spectral Data

EUMETRISPEC is a metrological UV-to-MIR Fouriertransformspectrometer infrastructure, aiming at highly accurate determination of molecular spectral reference data with high environmental or technical relevance. We describe the current hardware configuration, capabilities and recent results. Article not available.

Status of the THz activities at the MLS

We report the status of the MLS as a source of powerful, stable, and pulsed THz radiation. Additionally we show results from the commissioning of the experimental stations and first measurements in the THz spectral range.