Dr. Sean C. Casey Profile

Dr. Sean C. Casey

Associate Director at Univ of California San Diego

SPIE Involvement:

Author

Proceedings Article | 27 September 2012 Paper

SOFIA observatory performance and characterization

Pasquale Temi, Pamela Marcum, Walter Miller, Edward Dunham, Ian McLean, Jurgen Wolf, Eric Becklin, Thomas Bida, Rick Brewster, Sean Casey, Peter Collins, Scott Horner, Holger Jakob, Stephen Jensen, Jana Killebrew, Ulrich Lampater, Georgi Mandushev, Allen Meyer, Enrico Pfueller, Andreas Reinacher, Jeonghee Rho, Thomas Roellig, Maureen Savage, Erin Smith, Stefan Teufel, Manuel Wiedemann

Proceedings Volume 8444, 844414 (2012) https://doi.org/10.1117/12.925736

KEYWORDS: Telescopes, Observatories, Stars, Mirrors, Cameras, Image quality, Calibration, Infrared telescopes, Imaging systems, Pluto

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Proceedings Article | 23 June 2006 Paper

The SOFIA program: astronomers return to the stratosphere

Sean Casey

Proceedings Volume 6267, 62670Q (2006) https://doi.org/10.1117/12.674475

KEYWORDS: Telescopes, Observatories, Space telescopes, Mirrors, Astronomy, Infrared astronomy, Software development, Infrared radiation, Americium, Optical fabrication

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Proceedings Article | 30 September 2004 Paper

The SOFIA science instrument program: lessons learned

Sean Casey, Maureen Savage, Eric Becklin

Proceedings Volume 5492, (2004) https://doi.org/10.1117/12.552350

KEYWORDS: Observatories, Sensors, Detector development, Spectrometers, Data acquisition, Astronomy, Bolometers, Aerospace engineering, Cameras, Lead

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Proceedings Article | 30 September 2004 Paper

Development of the HAWC far-infrared camera for SOFIA

Doyal Harper, Arlin Bartels, Sean Casey, David Chuss, Jessie Dotson, Rhodri Evans, Steve Heimsath, Robert Hirsch, Scott Knudsen, Robert Loewenstein, S. Harvey Moseley, Matt Newcomb, Robert Pernic, Tim Rennick, Eric Sandberg, Dale Sandford, Maureen Savage, Robert Silverberg, Robert Spotz, George Voellmer, Paul Waltz, Shu-i Wang, C. Wirth

Proceedings Volume 5492, (2004) https://doi.org/10.1117/12.552151

KEYWORDS: Electronics, Telescopes, Sensors, Cameras, Optical filters, Helium, Cryogenics, Computing systems, Analog electronics, Mirrors

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Proceedings Article | 10 November 2003 Paper

Stratospheric Observatory for Infrared Astronomy: SOFIA

Jürgen Wolf, Sean Casey, Jacqueline Davidson

Proceedings Volume 5152, (2003) https://doi.org/10.1117/12.514769

KEYWORDS: Telescopes, Observatories, Space telescopes, Mirrors, Infrared telescopes, Infrared astronomy, Astronomical telescopes, Spectrometers, Astronomy, Cameras

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Proceedings Article | 18 December 2002 Paper

First-light SOFIA instruments

Alfred Krabbe, Sean Casey

Proceedings Volume 4818, (2002) https://doi.org/10.1117/12.458084

KEYWORDS: Sensors, Spectroscopy, Telescopes, Spectral resolution, Electronics, Observatories, Cameras, Optical fabrication, Space telescopes, Terahertz radiation

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Proceedings Article | 20 June 2000 Paper

HAWC: a far-infrared camera for SOFIA

Doyal Harper, Christine Allen, Michael Amato, Troy Ames, Arlin Bartels, Sean Casey, Rebecca Derro, Rhodri Evans, Ian Gatley, Stephen Heimsath, Alfonso Hermida, Murzy Jhabvala, Joel Kastner, Robert Loewenstein, Samuel Moseley, Robert Pernic, Timothy Rennick, Harvey Rhody, Dale Sandford, Richard Shafer, Peter Shirron, George Voellmer, Shu-i Wang, Jesse Wirth

Proceedings Volume 4014, (2000) https://doi.org/10.1117/12.389132

KEYWORDS: Sensors, Telescopes, Detector arrays, Cameras, Optical filters, Space telescopes, Bolometers, Data processing, Spatial resolution, Silicon

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Proceedings Article | 11 September 1998 Paper

First results with the Achromatic Interfero Coronograph

Pierre Baudoz, Yves Rabbia, Jean Gay, Emmanuel Rossi, Larry Petro, Sean Casey, Pierre Bely, Richard Burg, John MacKenty, Bruno Fleury, Pierre-Yves Madec

Proceedings Volume 3353, (1998) https://doi.org/10.1117/12.321671

KEYWORDS: Stars, Coronagraphy, Adaptive optics, Wavefronts, Cameras, Space telescopes, Nulling interferometry, Telescopes, Turbulence, Light

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Proceedings Article | 21 August 1998 Paper

Stratospheric Observatory for Infrared Astronomy (SOFIA)

Eric Becklin, Sean Casey, Jackie Davidson, Maureen Savage

Proceedings Volume 3354, (1998) https://doi.org/10.1117/12.317295

KEYWORDS: Telescopes, Observatories, Space telescopes, Infrared astronomy, Infrared telescopes, Astronomy, Spectroscopy, Mirrors, Imaging spectroscopy, Infrared radiation

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Proceedings Article | 21 August 1998 Paper

HAWC: a far-infrared camera for SOFIA

Doyal Harper, Samuel Moseley, Ian Gatley, Sean Casey, Rhodri Evans, Robert Loewenstein, Robert Pernic, Jesse Wirth

Proceedings Volume 3354, (1998) https://doi.org/10.1117/12.317251

KEYWORDS: Far infrared, Spatial resolution, Cameras, Sensors, Space telescopes, Telescopes, Infrared radiation, Infrared astronomy, Stars, Observatories

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Proceedings Article | 14 September 1994 Paper

Laser vacuum ultraviolet single photon ionization probing of III-V semiconductor growth

Sean Casey, April Alstrin, Adina Kunz, Stephen Leone

Proceedings Volume 2282, (1994) https://doi.org/10.1117/12.186629

KEYWORDS: Arsenic, Gallium, Ionization, Spectroscopy, Gallium arsenide, Vacuum ultraviolet, Ultraviolet radiation, Single photon, Silicon, Ions

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Proceedings Article | 14 September 1994 Paper

Single-photon ionization: laser optical probe technique for semiconductor growth

Adina Kunz, April Alstrin, Sean Casey, Stephen Leone

Proceedings Volume 2337, (1994) https://doi.org/10.1117/12.186647

KEYWORDS: Arsenic, Gallium arsenide, Semiconducting wafers, Photons, Gallium, Ionization, Semiconductors, Laser optics, Molecular beams, Silicon

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Proceedings Article | 1 April 1992 Paper

Intracavity laser photoelectron spectroscopy of Cr2-, Cr2H-, and Cr2D-

Sean Casey, Doreen Leopold

Proceedings Volume 1638, (1992) https://doi.org/10.1117/12.58161

KEYWORDS: Chromium, Molecules, Ions, Chemistry, Photoemission spectroscopy, Laser spectroscopy, Molecular spectroscopy, Transition metals, Chemical species, Microwave radiation

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The photoelectron spectrum of Cr₂^- shows vibrational levels in the ¹(Sigma) _g⁺ ground state of the neutral molecule up to 7300 cm^-1 above its zero point level. These data, obtained at an instrumental resolution of 5 meV (40 cm^-1), reveal a panoramic view of the controversial ground state potential curve of Cr₂. Low-lying vibrational levels are found to fit a Morse potential with (omega) _e equals 479 +/- 2 cm^-1 and (omega) _e(chi) _e equals 13.5 +/- 1.0 cm^-1. This unusually large anharmonicity extrapolates to a dissociation asymptote of only 0.5 eV, considerably lower than the true 1.44 eV value. Between 4875 and 7320 cm^-1 above the zero point level, we observe twenty peaks at 130 +/- 15 cm^-1 intervals, which we assign as transitions from the ground electronic and vibrational state of the anion to high vibrational levels of the Cr₂ ground state. Using an RKR inversion procedure, we have obtained a potential curve that fits all of the observed vibrational levels to within our experimental uncertainty. This potential curve is compared with the predictions of Goodgame and Goddard's modified GVB calculation. Transitions to highly excited vibrational levels of the Cr₂ ground state are far more intense than would be expected for a direct photodetachment process, and are also strongly wavelength dependent. These non-Franck-Condon intensities are attributed to a resonance of the laser with one or more metastable states of the negative ion far above the electron detachment threshold. The electron affinity of Cr₂ is measured to be 0.505 +/- 0.005 eV. An excited electronic state of Cr₂ with a vibrational frequency of 580 +/- 20 cm^-1 is observed 14,240 +/- 30 cm^-1 above the ground state. For Cr₂^-, we obtain (omega) _e equals 470 +/- 25 cm^-1, (omega) _e(chi) _e equals 20 +/- 10 cm^-1, and r_e equals 1.71 +/- 0.01 angstrom. Tentative state assignments of ¹(Sigma) _u⁺ or ³(Sigma) _u⁺ for the excited Cr₂ state, and ²(Sigma) _u⁺ for the anion, are discussed. Preliminary results for Cr₂H^- and Cr₂D^- are also presented. The photoelectron spectra of these anions reveal the Cr-Cr and Cr-H stretching frequencies in the neutral molecules, and exhibit partially resolved rotational structure.

Proceedings Article | 1 April 1992 Paper

Gas-phase study of the group VI transition metal tricarbonyl complexes by negative-ion photoelectron spectroscopy

Ashfaq Bengali, Sean Casey, Chun-Lin Cheng, Jonathan Dick, P. Fenn, Peter Villalta, Doreen Leopold

Proceedings Volume 1638, (1992) https://doi.org/10.1117/12.58165

KEYWORDS: Molecules, Metals, Ions, Carbon monoxide, Chemical species, Transition metals, Chemistry, Infrared spectroscopy, Chromium, Photoemission spectroscopy

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Showing 5 of 14 publications

Conference Committee Involvement (3)

Ground-based and Airborne Instrumentation for Astronomy II

23 June 2008 | Marseille, France

Ground-based and Airborne Instrumentation for Astronomy

25 May 2006 | Orlando, Florida , United States

Airborne Telescope Systems II

27 August 2002 | Waikoloa, Hawai'i, United States

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