Does a single atom cast a shadow?

Does a single atom cast a shadow

Does a single atom cast a shadow

Yes, single atoms do cast shadows! This has been understood for about 100 years but was only demonstrated experimentally recently, in this paper from 2012.

On the scale of things smaller than the wavelength of light, the shadow in the far field will never be smaller than the diffraction limit. Instead of a sharp outline that you see with macroscopic objects, the diffraction pattern formed by the shadow is a smooth function determined by the optics of the microscope.

Everything is partially transparent at this small scale as well, so the intensity of the shadow is determined by how much light the object can absorb. For individual atoms, the absorption is only significant at very narrow peaks in wavelength. So you need to be sure to tune your light source right at one of these peaks to get a decent shadow.

In the paper above, the authors trapped a single, laser-cooled ytterbium ion and used a light source tuned to a peak around 369.5 nm. That means they were imaging in UV, but in principle this approach could work with visible light as well. The final image showed about a 3% decrease in intensity at the center of the shadow. The wavelength of light used to illuminate the atom had to be precise to about one part per billion or the shadow disappeared.

Does a single atom cast a shadow? from askscience

Last Updated on

Abdominal Adhesions

What is the abdominal cavity?

The abdominal cavity is the internal area of the body between the chest and hips that contains the lower part of the esophagus, stomach, small intestine, and large intestine. The esophagus carries food and liquids from the mouth to the stomach, which slowly pumps them into the small and large intestines. Abdominal adhesions can kink, twist, or pull the small and large intestines out of place, causing an intestinal obstruction. Intestinal obstruction, also called a bowel obstruction, results in the partial or complete blockage of movement of food or stool through the intestines.

What causes abdominal adhesions? Abdominal surgery is the most frequent cause of abdominal adhesions. Surgery-related causes include cuts involving internal organs handling of internal organs drying out of internal organs and tissues contact of internal tissues with foreign materials, such as gauze, surgical gloves, and stitches blood or blood clots that were not rinsed away during surgery Abdominal adhesions can also result from inflammation not related to surgery, including appendix rupture radiation t

Source: Abdominal Adhesions | NIDDK

Last Updated on

Can ketoprofen and Celecoxib be used together?

Nonsteroidal Anti-Inflammatory Agents may enhance the adverse/toxic effect of NSAID (COX-2 Inhibitor).

The prescribing information for both celecoxib and etoricoxib recommends avoiding concurrent use with any other NSAID due to an increased risk for adverse reactions,

So.. Concurrent use of another NSAID together with a COX-2 inhibitor is not recommended and should be avoided.

Last Updated on

Pharmacist error dispensing VENTOLIN

Medication error for VENTOLIN

The error happened as the pharmacy staff is using handwriting, and this might cause error and confusion for the patient. The pharmacist instead of telling the patient to use the dose of 1MG, she told him to use the dose of 1ML, which is five times more.

As a result of this matter, an OVR was initiated by the pediatrician and RCA was started.

Last Updated on

1 23 24 25