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Why it is not possible to obtain blue phosphorescence from a transition that initially absorbs blue light. Also suggest why phosphoresence spectra are sometimes better for identifying useful electronic transition for possible laser transition than are flourescence spectra.

Why it is not possible to obtain blue phosphorescence from a transition that initially absorbs blue light. Also suggest why phosphoresence spectra are sometimes better for identifying useful electronic transition for possible laser transition than are flourescence spectra.

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Why it is not possible to obtain blue phosphorescence from a transition that initially absorbs blue light. Also suggest why phosphoresence spectra are sometimes better for identifying useful electronic transition for possible laser transition than are flourescence spectra.
clopolyenes will be aromatic: (a) neutral, (b) single negative ration with a + charge in the seven-membered ring and Why can its stability be attributed to an internal charge sepa- a - charge in the five-membered ring? 15 33. Within each of the following groups, predict which су- charge, and (c) double negative charge. 15.34. Do the same as in exercise 15.33, but for cyclopoly. enes with (a) a single positive charge and (b) double positive charge. 15.11 & 15.12 Fluorescence, Phosphorescence, and Lasers 15.35. Why can a population inversion not be achieved by simply heating a potentially laser-active material? 15.36. Suggest why phosphorescence spectra are sometimes better for identifying useful electronic transitions for possible laser transitions than are fluorescence spectra. 15.37. Would the light from fireflies be considered an exam- ple of a fluorescence or a phosphorescence process? 15.38. Why is it not possible to obtain blue fluorescence from a transition that initially absorbs red light? 15.39. CO2 lasers are among the most powerful cw lasers available; their most commonly emitted wavelength is 10.6 um. How many 10.6-um photons are generated each second from a CO, laser that emits 300,000 J per second? (That makes it a 300-kilovwatt laser.) 15.40. How many 632.8-nm photons must a He-Ne laser emit per second to achieve a power of 1 J/s? 15.41. Many high-power lasers emit only a little bit of energy but in an extremely short pulse. What is the power of a laser that emits a 300-millijoule pulse in 2.50 nanoseconds? 15.42. Explain why X-ray lasers would be extremely difficult to build. REDMI NOTE 8 PRO O AI QUAD CAMERA
Transcribed Image Text:clopolyenes will be aromatic: (a) neutral, (b) single negative ration with a + charge in the seven-membered ring and Why can its stability be attributed to an internal charge sepa- a - charge in the five-membered ring? 15 33. Within each of the following groups, predict which су- charge, and (c) double negative charge. 15.34. Do the same as in exercise 15.33, but for cyclopoly. enes with (a) a single positive charge and (b) double positive charge. 15.11 & 15.12 Fluorescence, Phosphorescence, and Lasers 15.35. Why can a population inversion not be achieved by simply heating a potentially laser-active material? 15.36. Suggest why phosphorescence spectra are sometimes better for identifying useful electronic transitions for possible laser transitions than are fluorescence spectra. 15.37. Would the light from fireflies be considered an exam- ple of a fluorescence or a phosphorescence process? 15.38. Why is it not possible to obtain blue fluorescence from a transition that initially absorbs red light? 15.39. CO2 lasers are among the most powerful cw lasers available; their most commonly emitted wavelength is 10.6 um. How many 10.6-um photons are generated each second from a CO, laser that emits 300,000 J per second? (That makes it a 300-kilovwatt laser.) 15.40. How many 632.8-nm photons must a He-Ne laser emit per second to achieve a power of 1 J/s? 15.41. Many high-power lasers emit only a little bit of energy but in an extremely short pulse. What is the power of a laser that emits a 300-millijoule pulse in 2.50 nanoseconds? 15.42. Explain why X-ray lasers would be extremely difficult to build. REDMI NOTE 8 PRO O AI QUAD CAMERA
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