Time Dependent Intramolecular Quantum Dynamics from High Resolution Spectroscopy and Laser Chemistry

1992 ◽  
pp. 293-310 ◽  
Author(s):  
Martin Quack
Keyword(s):  
High Resolution ◽  
Quantum Dynamics ◽  
Time Dependent ◽  
High Resolution Spectroscopy ◽  
Laser Chemistry

Synthesis, Structure, High-Resolution Spectroscopy, and Laser Chemistry of Fluorooxirane and 2,2-[2H2]-Fluorooxirane

1997 ◽  
Vol 36 (12) ◽  
pp. 140-143 ◽  
Author(s):  
Hans Hollenstein ◽  
David Luckhaus ◽  
Jörg Pochert ◽  
Martin Quack ◽  
Georg Seyfang
Keyword(s):  
High Resolution ◽  
High Resolution Spectroscopy ◽  
Laser Chemistry

scholarly journals Stellar Granulation and Photospheric Line Asymmetries

1988 ◽  
Vol 132 ◽  
pp. 239-247
Author(s):  
Dainis Dravins
Keyword(s):  
Fine Structure ◽  
High Resolution ◽  
Numerical Simulations ◽  
Three Dimensional ◽  
Stellar Surface ◽  
Time Dependent ◽  
High Resolution Spectroscopy ◽  
Line Profiles ◽  
Solar Granulation ◽  
Surface Convection

The fine structure of stellar photospheric convection (the stellar equivalent of solar granulation) can be analyzed with the aid of high-resolution spectroscopy. Photospheric absorption lines are slightly asymmetric and wavelength–shifted due to unequal photon contributions from bright and systematically Doppler–shifted granules and from darker intergranular areas. Numerical simulations of stellar surface convection in different stars have now been carried out, and such three–dimensional and time–dependent models predict the detailed stellar line profiles (including asymmetries and wavelength shifts), thus enabling a direct confrontation between observations and theory.

Microcalorimeters for X-Ray Spectroscopy

1988 ◽  
Vol 102 ◽  
pp. 41
Author(s):  
E. Silver ◽  
C. Hailey ◽  
S. Labov ◽  
N. Madden ◽  
D. Landis ◽  
...  
Keyword(s):  
High Resolution ◽  
High Efficiency ◽  
Thermal Response ◽  
Low Noise ◽  
High Resolution Spectroscopy ◽  
Superconducting Transition ◽  
Sapphire Substrates ◽  
Laboratory Plasmas ◽  
Adiabatic Demagnetization ◽  
Theoretical Predictions

The merits of microcalorimetry below 1°K for high resolution spectroscopy has become widely recognized on theoretical grounds. By combining the high efficiency, broadband spectral sensitivity of traditional photoelectric detectors with the high resolution capabilities characteristic of dispersive spectrometers, the microcalorimeter could potentially revolutionize spectroscopic measurements of astrophysical and laboratory plasmas. In actuality, however, the performance of prototype instruments has fallen short of theoretical predictions and practical detectors are still unavailable for use as laboratory and space-based instruments. These issues are currently being addressed by the new collaborative initiative between LLNL, LBL, U.C.I., U.C.B., and U.C.D.. Microcalorimeters of various types are being developed and tested at temperatures of 1.4, 0.3, and 0.1°K. These include monolithic devices made from NTD Germanium and composite configurations using sapphire substrates with temperature sensors fabricated from NTD Germanium, evaporative films of Germanium-Gold alloy, or material with superconducting transition edges. A new approache to low noise pulse counting electronics has been developed that allows the ultimate speed of the device to be determined solely by the detector thermal response and geometry. Our laboratory studies of the thermal and resistive properties of these and other candidate materials should enable us to characterize the pulse shape and subsequently predict the ultimate performance. We are building a compact adiabatic demagnetization refrigerator for conveniently reaching 0.1°K in the laboratory and for use in future satellite-borne missions. A description of this instrument together with results from our most recent experiments will be presented.

scholarly journals Spectroscopic characterization of a thermodynamically stable doubly charged diatomic molecule: MgAr2+

2021 ◽  
Author(s):  
Dominik Wehrli ◽  
Matthieu Génévriez ◽  
Frédéric Merkt
Keyword(s):  
High Resolution ◽  
Diatomic Molecule ◽  
Spectroscopic Characterization ◽  
New Method ◽  
High Resolution Spectroscopy ◽  
Singly Charged ◽  
Doubly Charged

We present a new method to study doubly charged molecules relying on high-resolution spectroscopy of the singly charged parent cation, and report on the first spectroscopic characterization of a thermodynamically stable diatomic dication, MgAr2+.

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