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Key research programs of OIR scientists include the large scale structure of the universe, evolution of galaxies in clusters, the explosive activity in galaxy nuclei, the history of star formation in galaxies, the detailed structure of our own Milky Way galaxy and the nearest galaxy, Andromeda, and the study of explosive stars, both near and far.

The Giant Magellan Telescope (GMT) will begin a new era of observation in astrophysics, and represents a huge leap forward in the technology used for astronomy. Equipped with instrumentation capable of detecting the spectral signature of atmospheric oxygen in distant exoplanets, the GMT may be humanity’s next best chance of discovering signs of life on other worlds.

The diffraction effect of the objective aperture is important for HRTEM imaging. The radius of the Airy disk produced by the objective aperture is given by,          rAiry ~ 1.2λf/D ---------------- [3743b] where,          f -- The focal length of the lens;          D -- The aperture diameter.

where,           Î± -- The convergence semi-angle (also called maximum diffraction angle);           Î» -- The wavelength of the incident electron beam.

Radius ofAiry diskformula

The OIR division also has provided the Magellan 6.5m Clay telescope with an f/5 secondary mirror and a wide field imager, further enhancing the abilities of that telescope for CfA astronomers.

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The Center for Astrophysics | Harvard & Smithsonian Optical and Infrared Astronomy (OIR) division focuses on extragalactic and galactic astronomy emphasizing studies of the large-scale structure of the Universe, clusters of stars and of galaxies, and the formation and evolution of stars and planets by using data from satellite-, balloon-, and ground-based observatories; and development of spectroscopy and imaging techniques.

Airy diskpattern

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Scott Edmunds is Editor-in-Chief for GigaScience and an Executive Committee member for Open Data Hong Kong. He has co-founded Citizen Science organisations ...

Airy diskformula

[1] Methods in Cell Biology, Vol. 81, DOI: 10.1016/S0091-679X(06)81002-2, David E. Wolf, The Optics of Microscope Image Formation, (2007).

OIR operates the Fred Lawrence Whipple Observatory on Mt Hopkins in Arizona, which is comprised of the MMT, a 6.5m telescope jointly operated with the University of Arizona, and three smaller telscopes, a 1.5m, a 1.3m and a 1.2m telescope, all using instruments built in the OIR division. Several robotic telescopes are also located nearby: the HAT project, Minerva, and Mearth, all being run by other groups under the umbrella of the OIR division. The Veritas gamma ray array is located at the base of Mt Hopkins, operated by a consortium of universities worldwide.

Airy diskand resolution

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Airy diskMicroscopy

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Dec 16, 2022 — This is known as the thin lens equation: 1/f = 1/di + 1/do, where f is the focal length, di is the distance from the lens to the image sensor, ...

Optical Telescope Data Archive of spectral data from other instruments: the FAST spectrograph, Z-Machine spectrograph, and the MMT Blue Channel Reticon Spectrograph.

Astronomers in the division were key players in the development of the NASA Spitzer telescope, providing one of the essential instruments, and have contributed to the design of several subsequent satellites. OIR scientists are also major contributors to the design of the Giant Magellan Telescope to be located on Las Campanas, and to two of the instruments under construction that will be used at first light, in 2029.

Airy Disktelescope

The SAO Telescope Data Center in Cambridge, Massachusetts, supports the above optical telescopes operated by the Center for Astrophysics | Harvard & Smithsonian with the following services:

The Center for Astrophysics | Harvard & Smithsonian Optical and Infrared Astronomy (OIR) division has two major charges. One is to operate and develop telescopes and associated instruments and the other is to do forefront research on a wide variety of galactic and extragalactic topics, often but not exclusively using those very telescopes.

In conventional TEM system, the existence of spherical aberration requires the utility of very small apertures to maximize the spatial resolution, while the resolution will also be limited by diffraction if the apertures are too small.

Airy diskradius

Airy diskcalculator

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This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.

Based on the Rayleigh criteria, the ability (spatial resolution) of the microscope to resolve two spots as two essentially relates to how sharply the Airy disks are defined. As the disks get closer, the intensity dip between the two spots becomes smaller. For instance, the two spots can be resolved in Figure 3743 (a) and (b), while they cannot be resolved in Figure 3743 (c).

For an ideal objective lens, the incident electron probe simply forms an Airy disk in the back focal plane of the lens. This disk is the Fourier transform of the uniformly illuminated condenser aperture.

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Optical Telescope Schedules. Current and past schedules for the FLWO 1.2-meter, FLWO 1.5-meter, MMT and Magellan telescopes are online.

The book author (Yougui Liao) welcomes your comments, suggestions, and corrections, please click here for submission. If you let book author know once you have cited this book, the brief information of your publication will appear on the “Times Cited” page.