Zobrazeno 1 - 10
of 139
pro vyhledávání: '"PORTER, F. Scott"'
Autor:
Shah, Chintan, Kühn, Steffen, Bernitt, Sonja, Steinbrügge, René, Togawa, Moto, Berger, Lukas, Buck, Jens, Hoesch, Moritz, Seltmann, Jörn, Kozlov, Mikhail G., Porsev, Sergey G., Gu, Ming Feng, Porter, F. Scott, Pfeifer, Thomas, Leutenegger, Maurice A., Cheung, Charles, Safronova, Marianna S., López-Urrutia, José R. Crespo
Publikováno v:
Physical Review A 109, 063108 (2024)
We used the monochromatic soft-x-ray beamline P04 at the synchrotron-radiation facility PETRA III to resonantly excite the strongest $2p-3d$ transitions in neon-like Ni XIX ions, $[2p^6]_{J=0} \rightarrow [(2p^5)_{1/2}\,3d_{3/2}]_{J=1}$ and $[2p^6]_{
Externí odkaz:
http://arxiv.org/abs/2404.14589
Autor:
Shah, Chintan, Togawa, Moto, Botz, Marc, Danisch, Jonas, Goes, Joschka J., Bernitt, Sonja, Maxton, Marleen, Köbnick, Kai, Buck, Jen, Seltmann, Jörn, Hoesch, Moritz, Gu, Ming Feng, Porter, F. Scott, Pfeifer, Thomas, Leutenegger, Maurice A., Cheung, Charles, Safronova, Marianna S., López-Urrutia, José R. Crespo
Publikováno v:
The Astrophysical Journal, 969, 52 (2024)
We improve by a factor of 4-20 the energy accuracy of the strongest soft X-ray transitions of Fe XVII ions by resonantly exciting them in an electron beam ion trap with a monochromatic beam at the P04 beamline of the PETRA III synchrotron facility. B
Externí odkaz:
http://arxiv.org/abs/2401.08395
Autor:
Dunn, William R., Koutroumpa, Dimitra, Carter, Jennifer A., Kuntz, Kip D., McEntee, Sean, Deskins, Thomas, Parry, Bryn, Wolk, Scott, Lisse, Carey, Dennerl, Konrad, Jackman, Caitriona M., Weigt, Dale M., Porter, F. Scott, Branduardi-Raymont, Graziella, Bodewits, Dennis, Leppard, Fenn, Foster, Adam, Gladstone, G. Randall, Parmar, Vatsal, Brophy-Lee, Stephenie, Feldman, Charly, Ness, Jan-Uwe, Cumbee, Renata, Markevitch, Maxim, Kraft, Ralph, Bogdan, Akos, Bhardwaj, Anil, Wibisono, Affelia, Mernier, Francois, Ogorzalek, Anna
The Line Emission Mapper's (LEM's) exquisite spectral resolution and effective area will open new research domains in Astrophysics, Planetary Science and Heliophysics. LEM will provide step-change capabilities for the fluorescence, solar wind charge
Externí odkaz:
http://arxiv.org/abs/2310.13873
Autor:
Gu, Liyi, Shah, Chintan, Mao, Junjie, Raassen, A. J. J., de Plaa, Jelle, Pinto, Ciro, Akamatsu, Hiroki, Werner, Norbert, Simionescu, Aurora, Mernier, Francois, Sawada, Makoto, Mohanty, Pranav, Amaro, Pedro, Gu, Ming Feng, Porter, F. Scott, Lopez-Urrutia, Jose R. Crespo, Kaastra, Jelle S.
Publikováno v:
A&A 664, A62 (2022)
There has been a growing request from the X-ray astronomy community for a quantitative estimate of systematic uncertainties originating from the atomic data used in plasma codes. Though there have been several studies looking into atomic data uncerta
Externí odkaz:
http://arxiv.org/abs/2206.07134
Autor:
Kühn, Steffen, Cheung, Charles, Oreshkina, Natalia S., Steinbrügge, René, Togawa, Moto, Bernitt, Sonja, Berger, Lukas, Buck, Jens, Hoesch, Moritz, Seltmann, Jörn, Trinter, Florian, Keitel, Christoph H., Kozlov, Mikhail G., Porsev, Sergey G., Gu, Ming Feng, Porter, F. Scott, Pfeifer, Thomas, Leutenegger, Maurice A., Harman, Zoltán, Safronova, Marianna S., López-Urrutia, José R. Crespo, Shah, Chintan
Publikováno v:
Physical Review Letters 129, 245001 (2022)
One of the most enduring and intensively studied problems of X-ray astronomy is the disagreement of state-of-the art theory and observations for the intensity ratio of two Fe XVII transitions of crucial value for plasma diagnostics, dubbed 3C and 3D.
Externí odkaz:
http://arxiv.org/abs/2201.09070
Autor:
Shah, Chintan, Hell, Natalie, Hubbard, Antonia, Gu, Ming Feng, MacDonald, Michael J., Eckart, Megan E., Kelley, Richard L., Kilbourne, Caroline A., Leutenegger, Maurice A., Porter, F. Scott, Brown, Gregory V.
Publikováno v:
The Astrophysical Journal, 914, 34 (2021)
We report measurements of electron-impact excitation cross sections for the strong K-shell n=2-1 transitions in S XV using the LLNL EBIT-I electron beam ion trap, two crystal spectrometers, and the EBIT Calorimeter Spectrometer. The cross sections ar
Externí odkaz:
http://arxiv.org/abs/2106.06493
Autor:
Gu, Liyi, Shah, Chintan, Mao, Junjie, Raassen, A. J. J., de Plaa, Jelle, Pinto, Ciro, Akamatsu, Hiroki, Werner, Norbert, Simionescu, Aurora, Mernier, François, Sawada, Makoto, Mohanty, Pranav, Amaro, Pedro, Gu, Ming Feng, Porter, F. Scott, López-Urrutia, José R. Crespo, Kaastra, Jelle S.
Publikováno v:
A&A 641, A93 (2020)
The Hitomi results for the Perseus cluster have shown that accurate atomic models are essential to the success of X-ray spectroscopic missions, and just as important as knowledge on instrumental calibration and astrophysical modeling. Preparing the m
Externí odkaz:
http://arxiv.org/abs/2007.03843
Autor:
Togawa, Moto, Kühn, Steffen, Shah, Chintan, Amaro, Pedro, Steinbrügge, René, Stierhof, Jakob, Hell, Natalie, Rosner, Michael, Fujii, Keisuke, Bissinger, Matthias, Ballhausen, Ralf, Hoesch, Moritz, Seltmann, Jörn, Park, SungNam, Grilo, Filipe, Porter, F. Scott, Santos, José Paulo, Chung, Moses, Stöhlker, Thomas, Wilms, Jörn, Pfeifer, Thomas, Brown, Gregory V., Leutenegger, Maurice A., Bernitt, Sven, López-Urrutia, José R. Crespo
Publikováno v:
Physical Review A 102, 052831 (2020)
We resonantly excite the $K$ series of O$^{5+}$ and O$^{6+}$ up to principal quantum number $n=11$ with monochromatic x rays, producing $K$-shell holes, and observe their relaxation by soft-x-ray emission. Some photoabsorption resonances of O$^{5+}$
Externí odkaz:
http://arxiv.org/abs/2003.05965
Autor:
Kühn, Steffen, Shah, Chintan, López-Urrutia, José R. Crespo, Fujii, Keisuke, Steinbrügge, René, Stierhof, Jakob, Togawa, Moto, Harman, Zoltán, Oreshkina, Natalia S., Cheung, Charles, Kozlov, Mikhail G., Porsev, Sergey G., Safronova, Marianna S., Berengut, Julian C., Rosner, Michael, Bissinger, Matthias, Ballhausen, Ralf, Hell, Natalie, Park, SungNam, Chung, Moses, Hoesch, Moritz, Seltmann, Jörn, Surzhykov, Andrey S., Yerokhin, Vladimir A., Wilms, Jörn, Porter, F. Scott, Stöhlker, Thomas, Keitel, Christoph H., Pfeifer, Thomas, Brown, Gregory V., Leutenegger, Maurice A., Bernitt, Sven
Publikováno v:
Phys. Rev. Lett. 124, 225001 (2020)
For more than 40 years, most astrophysical observations and laboratory studies of two key soft x-ray diagnostic $2p-3d$ transitions, $3C$ and $3D$, in Fe XVII ions found oscillator strength ratios $f(3C)/f(3D)$ disagreeing with theory, but uncertaint
Externí odkaz:
http://arxiv.org/abs/1911.09707
Autor:
Wulf, Dallas, Eckart, Megan E, Galeazzi, Massimiliano, Jaeckel, Felix, Kelley, Richard L, Kilbourne, Caroline A, Morgan, Kelsey M, McCammon, Dan, Porter, F Scott, Szymkowiak, Andrew E
Publikováno v:
ApJ 884 120 (2019)
We present here a combined analysis of four high spectral resolution observations of the Diffuse X-ray Background (DXRB), made using the University of Wisconsin-Madison/Goddard Space Flight Center X-ray Quantum Calorimeter (XQC) sounding rocket paylo
Externí odkaz:
http://arxiv.org/abs/1909.07432