منابع مشابه
Two-dimensional spectral observations of sunspots in chromospheric lines
We present two-dimensional spectral observations of two closely located small sunspots in chromospheric lines. Line asymmetries and shifts are derived for the Ca ii K line in particular. It is found that the majority of Ca ii K profiles show a blue asymmetry. Red asymmetry may also appear, but only in some tiny regions. Some ephemeral blue asymmetry patches are found in the umbrae, which seem t...
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We have developed a two-dimensional (2D) Fourier-transform femtosecond spectroscopy technique for the visible spectral region. Three-pulse photon echo signals are generated in a phase-matched noncollinear four-wave mixing box geometry that employs a 3-kHz repetition-rate laser system and optical parametric amplification. Nonlinear signals are fully characterized in amplitude and phase by spectr...
متن کاملTwo-dimensional Two Contact Double Resonance Spectroscopy
A two-dimensional spectroscopic technique is presented. Application of the technique to determine all the relaxation rates for a multi-level quadrupole system is discussed along with experimental requirements. Theoretical and experimental data are analyzed for theN, three level, spin 1 system. The analysis shows that all three relaxation rates can be obtained from a single two-dimensional spect...
متن کاملTwo-dimensional Two-frequency NQR Spectroscopy *
für Naturforschung in cooperation with the Max Planck Society for the Advancement of Science under a Creative Commons Attribution 4.0 International License. Dieses Werk wurde im Jahr 2013 vom Verlag Zeitschrift für Naturforschung in Zusammenarbeit mit der Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V. digitalisiert und unter folgender Lizenz veröffentlicht: Creative Commons Namen...
متن کاملTwo-dimensional Raman-terahertz spectroscopy of water.
Two-dimensional Raman-terahertz (THz) spectroscopy is presented as a multidimensional spectroscopy directly in the far-IR regime. The method is used to explore the dynamics of the collective intermolecular modes of liquid water at ambient temperatures that emerge from the hydrogen-bond networks water forming. Two-dimensional Raman-THz spectroscopy interrogates these modes twice and as such can ...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2008
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20078279