scholarly journals Ultimate Limit in the Spectral Resolution of Extreme Ultraviolet Frequency Combs

2017 ◽  
Vol 118 (14) ◽  
Author(s):  
C. Corsi ◽  
I. Liontos ◽  
M. Bellini ◽  
S. Cavalieri ◽  
P. Cancio Pastor ◽  
...  
Keyword(s):  
Spectral Resolution ◽  
Extreme Ultraviolet ◽  
Frequency Combs ◽  
Ultimate Limit

scholarly journals ‘Sumer’ – Solar Ultraviolet Measurements of Emitted Radiation

1994 ◽  
Vol 144 ◽  
pp. 619-624 ◽  
Author(s):  
K. Wilhelm ◽  
W. Curdt ◽  
A. H. Gabriel ◽  
M. Grewing ◽  
M. C. E. Huber ◽  
...  
Keyword(s):  
Spectral Resolution ◽  
Extreme Ultraviolet ◽  
Flow Characteristics ◽  
Magnetic Activity ◽  
High Accuracy ◽  
The Sun ◽  
Lower Corona ◽  
Doppler Shifts ◽  
Solar Magnetic Activity ◽  
Solar Ultraviolet

AbstractThe experiment Solar Ultraviolet Measurements of Emitted Radiation (SUMER) is designed for the investigations of plasma flow characteristics, turbulence and wave motions, plasma densities and temperatures, structures and events associated with solar magnetic activity in the chromosphere, the transition zone and the corona. Specifically, SUMER will measure profiles and intensities of extreme ultraviolet (EUV) lines emitted in the solar atmosphere ranging from the upper chromosphere to the lower corona; determine line broadenings, spectral positions and Doppler shifts with high accuracy; provide stigmatic images of selected areas of the Sun in the EUV with high spatial, temporal and spectral resolution and obtain full images of the Sun and the inner corona in selectable EUV lines, corresponding to a temperature range from 104to more than 1.8 x 106K. The spatial and spectral resolution capabilities of the instrument will be considered in this contribution in some detail, and a new detector concept will be introduced.

Phase-locked, time-delayed, harmonic pulses for high spectral resolution in the extreme ultraviolet: errata

2001 ◽  
Vol 26 (21) ◽  
pp. 1729
Author(s):  
M. Bellini ◽  
S. Cavalieri ◽  
C. Corsi ◽  
M. Materazzi
Keyword(s):  
Spectral Resolution ◽  
Extreme Ultraviolet ◽  
High Spectral Resolution

scholarly journals Expected Scientific Performance of the Three Spectrometers on the Extreme Ultraviolet Explorer

1990 ◽  
Vol 115 ◽  
pp. 335-338
Author(s):  
J. V. Vallerga ◽  
P. Jelinsky ◽  
P. W. Vedder ◽  
R. F. Malina
Keyword(s):  
Wavelength Range ◽  
Spectral Resolution ◽  
Line Source ◽  
White Dwarfs ◽  
Extreme Ultraviolet ◽  
Cataclysmic Variables ◽  
Effective Area ◽  
Light Sources ◽  
Scientific Performance ◽  
Astronomical Satellite

AbstractThe expected in-orbit performance of the three spectrometers included on the Extreme Ultraviolet Explorer (EUVE) astronomical satellite is presented. Recent calibrations of the gratings, mirrors and detectors using monochromatic and continuum EUV light sources allow the calculation of the spectral resolution and throughput of the instrument. An effective area range of 0.2 to 2.8 cm2 is achieved over the wavelength range 70-600Å with a peak spectral resolution λ/Δλ (FWHM) of ~ 360 assuming a spacecraft pointing knowledge of 10 arc seconds (FWHM). For a 40,000 sec observation, the average 3σ sensitivity to a monochromatic line source is 3 × 103 photons cm-2 sec-1. Simulated observations of known classes of EUV sources such as hot white dwarfs and cataclysmic variables are also presented.

EXTREME ULTRAVIOLET FREQUENCY COMBS FOR SPECTROSCOPY

2009 ◽  
Author(s):  
A. Ozawa ◽  
M. Herrmann ◽  
A. Vernaleken ◽  
Ch. Gohle ◽  
B. Bernhardt ◽  
...  
Keyword(s):  
Extreme Ultraviolet ◽  
Frequency Combs

scholarly journals Quasi-supercontinuum source in the extreme ultraviolet using multiple frequency combs from high-harmonic generation

2017 ◽  
Vol 25 (6) ◽  
pp. 6936 ◽  
Author(s):  
Martin Wünsche ◽  
Silvio Fuchs ◽  
Stefan Aull ◽  
Jan Nathanael ◽  
Max Möller ◽  
...  
Keyword(s):  
Harmonic Generation ◽  
Extreme Ultraviolet ◽  
High Harmonic ◽  
High Harmonic Generation ◽  
Multiple Frequency ◽  
Frequency Combs

scholarly journals ORFEUS observation of the central star of NGC 6543

1997 ◽  
Vol 180 ◽  
pp. 136-136
Author(s):  
J. Zweigle ◽  
M. Grewing ◽  
J. Barnstedt ◽  
M. Gölz ◽  
W. Gringel ◽  
...  
Keyword(s):  
Spectral Resolution ◽  
Planetary Nebula ◽  
Extreme Ultraviolet ◽  
Wavelength Region ◽  
Central Star ◽  
University Of California ◽  
Satellite Mission ◽  
Ultraviolet Spectrometer ◽  
Far Ultraviolet ◽  
The University

During the ORFEUS-SPAS (Orbiting Retrievable Far and Extreme Ultraviolet Spectrometer on the Shuttle Pallet Satellite) mission STS-51, flown in September 1993, we observed the central star of the planetary nebula NGC 6543 in the far ultraviolet (90 nm to 115 nm) wavelength region using the University of California, Berkeley spectrometer with a spectral resolution of 0.03 nm.

scholarly journals Photoionization in the time and frequency domain

Science ◽  
2017 ◽  
Vol 358 (6365) ◽  
pp. 893-896 ◽  
Author(s):  
M. Isinger ◽  
R. J. Squibb ◽  
D. Busto ◽  
S. Zhong ◽  
A. Harth ◽  
...  
Keyword(s):  
Spectral Resolution ◽  
Electron Emission ◽  
Time Delays ◽  
Extreme Ultraviolet ◽  
Theoretical Calculations ◽  
Interferometric Technique ◽  
Direct Ionization ◽  
Ultrafast Processes ◽  
Light Pulses ◽  
Ultrashort Light Pulses

Ultrafast processes in matter, such as the electron emission after light absorption, can now be studied using ultrashort light pulses of attosecond duration (10−18 seconds) in the extreme ultraviolet spectral range. The lack of spectral resolution due to the use of short light pulses has raised issues in the interpretation of the experimental results and the comparison with theoretical calculations. We determine photoionization time delays in neon atoms over a 40–electron volt energy range with an interferometric technique combining high temporal and spectral resolution. We spectrally disentangle direct ionization from ionization with shake-up, in which a second electron is left in an excited state, and obtain excellent agreement with theoretical calculations, thereby solving a puzzle raised by 7-year-old measurements.

scholarly journals Ultraviolet Observations of Stellar Coronae: Early Results from HST

1992 ◽  
Vol 9 ◽  
pp. 657-658
Author(s):  
J.L. Linsky
Keyword(s):  
High Resolution ◽  
Spectral Resolution ◽  
Solar Flares ◽  
Extreme Ultraviolet ◽  
The Sun ◽  
X Ray ◽  
Spectroscopic Diagnostics ◽  
Early Results ◽  
Active Stars ◽  
Ultraviolet Observations

Although coronae for stars other than the Sun have previously been detected only in the X-ray and radio portions of the spectrum, the HST and future spacecraft sensitive to ultraviolet (UV) and extreme ultraviolet (ETIV) light will have the spectral resolution to study the dynamics and spectroscopic diagnostics of hot coronal plasmas. In the UV region accessible to HST, forbidden lines of FeXII at 1242 and 1349Å, of FeXXI at 1354Å, and other species seen in solar flares, are predicted to be present in the spectra of active stars. Upcoming observations with the Goddard High Resolution Spectrograph (GHRS) by S. Maran will search for these lines in the dM2e star AU Mic and other stars.

Sign in / Sign up

Export Citation Format

Share Document