DISCLAIMER: This article is being kept online for historical purposes. Though accurate at last review, it is no longer being updated. The page may contain broken links or outdated information.
Marder, Seth R. Department of Chemistry, The University of Arizona, Tucson, Arizona.
Perry, Joseph W. Department of Chemistry, The University of Arizona, Tucson, Arizona.
- Excitation processes
- Molecule design
- Two-photon-initiated chemistry
- Related Primary Literature
- Additional Reading
Chemists have developed tremendous expertise in designing and synthesizing dye molecules which efficiently absorb light of a specified wavelength. Such strongly absorbing molecules have been used for many applications, including dyeing, photography, initiation of chemical reactions, and optical filtering. The probability of a molecule absorbing one photon is proportional to the intensity of the input beam. With sufficiently intense light, such as a laser beam, it is possible for a molecule to absorb simultaneously two photons, each of approximately half the energy (twice the wavelength, λ) normally required to reach an excited state. This two-photon absorption process is intrinsically weak relative to one-photon excitation. The probability of a molecule absorbing two photons simultaneously is proportional to the square of the intensity of the input beam. Advances in recent years have provided a rational basis for the design of efficient two-photon-absorbing molecules and have demonstrated their application in photonics, materials science, and biology.
The content above is only an excerpt.
for your institution. Subscribe
To learn more about subscribing to AccessScience, or to request a no-risk trial of this award-winning scientific reference for your institution, fill in your information and a member of our Sales Team will contact you as soon as possible.
to your librarian. Recommend
Let your librarian know about the award-winning gateway to the most trustworthy and accurate scientific information.
AccessScience provides the most accurate and trustworthy scientific information available.
Recognized as an award-winning gateway to scientific knowledge, AccessScience is an amazing online resource that contains high-quality reference material written specifically for students. Contributors include more than 9000 highly qualified scientists and 43 Nobel Prize winners.
MORE THAN 8700 articles covering all major scientific disciplines and encompassing the McGraw-Hill Encyclopedia of Science & Technology and McGraw-Hill Yearbook of Science & Technology
115,000-PLUS definitions from the McGraw-Hill Dictionary of Scientific and Technical Terms
3000 biographies of notable scientific figures
MORE THAN 19,000 downloadable images and animations illustrating key topics
ENGAGING VIDEOS highlighting the life and work of award-winning scientists
SUGGESTIONS FOR FURTHER STUDY and additional readings to guide students to deeper understanding and research
LINKS TO CITABLE LITERATURE help students expand their knowledge using primary sources of information