John Howard is an optical physicist known for his contributions to the field of optics and photonics. His work has often focused on areas such as laser technology, imaging systems, and the development of optical materials. Specific details about his research contributions, publications, or institutional affiliations may vary, so for the most accurate and up-to-date information, it's best to consult academic databases or professional publications related to optics and photonics.
Johannes Rydberg was a Swedish physicist known for his work in the field of spectroscopy. He is most famous for formulating the Rydberg formula, which describes the wavelengths of spectral lines of hydrogen. The Rydberg formula laid the groundwork for understanding atomic spectra and is integral to quantum mechanics. His contributions helped to establish the field of atomic physics, and his work provided a crucial link between classical physics and the later development of quantum mechanics.
Richard Smalley was an American chemist best known for his work in nanotechnology and for his co-discovery of fullerenes, molecular structures composed entirely of carbon, resembling hollow spheres, ellipses, or tubes. This discovery earned him the Nobel Prize in Chemistry in 1996, which he shared with Robert Curl and Harold Kroto.
Kevin K. Lehmann is a German entrepreneur and heir known for his significant wealth and status as a billionaire. He is notably recognized for being one of the youngest billionaires in the world, primarily due to his inheritance from his father, Guenther Lehmann, who is the founder of dm-drogerie markt, a large drugstore chain in Germany. Kevin is involved in various business ventures and investments and has gained attention for his entrepreneurial activities as well as his philanthropic efforts.
Manuel Cardona is a renowned Spanish physicist known for his contributions to condensed matter physics, particularly in the fields of semiconductor physics and nanotechnology. He has made significant advancements in understanding the electronic properties of materials and their applications in various technologies.
Margaret Lindsay Huggins (1848–1915) was a notable British astronomer known for her contributions to astrophotography and spectroscopy in the late 19th and early 20th centuries. She was particularly recognized for her work in capturing images of celestial objects and her research on the spectra of stars. Huggins collaborated closely with her husband, William Huggins, who was also an accomplished astronomer.
As of my last knowledge update in October 2021, Martin Suhm is a theoretical physicist known for his work in the field of condensed matter physics and quantum information. He has conducted research on various complex systems, including quantum many-body systems and the mathematical aspects of quantum mechanics.
Michael Kasha was a prominent American chemist known for his significant contributions to the fields of photochemistry and molecular spectroscopy. Born on February 2, 1920, Kasha is best known for Kasha's Rule, which describes the efficiency of energy transfer in excited states of molecules, particularly in relation to fluorescence and phosphorescence. His work has had a profound impact on understanding the behavior of excited states in various chemical systems.
First observed directly by the Cowan-Reines neutrino experiment.
composite particle made up of an even number of elementary particles, most commonly one particle and one anti-particle.
This can be contrasted with mesons, which have an odd number of elementary particles, as mentioned at baryon vs meson vs lepton.
Conceptually the simplest mesons. All of them have neutral color charge:
- charged: down + anti-up or up + anti-down, therefore with net electrical charge electron charge
- neutral: down + anti-down or up + anti-up, therefore with net electrical charge 0
A single line in the emission spectrum.
Has been the leading motivation of the development of quantum mechanics, all the way from the:
- Schrödinger equation: major lines predicted, including Zeeman effect, but not finer line splits like fine structure
- Dirac equation: explains fine structure 2p spin split due to electron spin/orbit interactions, but not Lamb shift
- quantum electrodynamics: explains Lamb shift
- hyperfine structure: due to electron/nucleus spin interactions, offers a window into nuclear spin
Are particles bounced by the first wall in the double slit experiment? by 
Ciro Santilli 40 Updated 2025-07-16
Ciro Santilli 40 Updated 2025-07-16It would be amazing to answer this with single particle double slit experiment measurements!
Pinned article: Introduction to the OurBigBook Project
Welcome to the OurBigBook Project! Our goal is to create the perfect publishing platform for STEM subjects, and get university-level students to write the best free STEM tutorials ever.
Everyone is welcome to create an account and play with the site: ourbigbook.com/go/register. We belive that students themselves can write amazing tutorials, but teachers are welcome too. You can write about anything you want, it doesn't have to be STEM or even educational. Silly test content is very welcome and you won't be penalized in any way. Just keep it legal!
Intro to OurBigBook
. Source. We have two killer features:
- topics: topics group articles by different users with the same title, e.g. here is the topic for the "Fundamental Theorem of Calculus" ourbigbook.com/go/topic/fundamental-theorem-of-calculusArticles of different users are sorted by upvote within each article page. This feature is a bit like:
- a Wikipedia where each user can have their own version of each article
- a Q&A website like Stack Overflow, where multiple people can give their views on a given topic, and the best ones are sorted by upvote. Except you don't need to wait for someone to ask first, and any topic goes, no matter how narrow or broad
This feature makes it possible for readers to find better explanations of any topic created by other writers. And it allows writers to create an explanation in a place that readers might actually find it.
Figure 1. Screenshot of the "Derivative" topic page. View it live at: ourbigbook.com/go/topic/derivativeVideo 2. OurBigBook Web topics demo. Source. - local editing: you can store all your personal knowledge base content locally in a plaintext markup format that can be edited locally and published either:This way you can be sure that even if OurBigBook.com were to go down one day (which we have no plans to do as it is quite cheap to host!), your content will still be perfectly readable as a static site.
- to OurBigBook.com to get awesome multi-user features like topics and likes
- as HTML files to a static website, which you can host yourself for free on many external providers like GitHub Pages, and remain in full control
Figure 3. Visual Studio Code extension installation.
Figure 4. Visual Studio Code extension tree navigation.
Figure 5. Web editor. You can also edit articles on the Web editor without installing anything locally.Video 3. Edit locally and publish demo. Source. This shows editing OurBigBook Markup and publishing it using the Visual Studio Code extension.Video 4. OurBigBook Visual Studio Code extension editing and navigation demo. Source. 
- Infinitely deep tables of contents:
All our software is open source and hosted at: github.com/ourbigbook/ourbigbook
Further documentation can be found at: docs.ourbigbook.com
Feel free to reach our to us for any help or suggestions: docs.ourbigbook.com/#contact