Timeline for When pigments absorb light only around a single particular wavelength, why aren't they still white?
Current License: CC BY-SA 4.0
16 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Dec 28, 2021 at 16:30 | vote | accept | Bernhard Werner | ||
| Dec 28, 2021 at 13:07 | comment | added | Poutnik | Being a pigment and absorbing just around single wavelength mutually excludes each other. You would need atomized matter in gaseous state for that. Molecules and/or condensed phases have quite broad absorption bands or even wavelength regions. | |
| Dec 28, 2021 at 1:58 | history | removed from network questions | orthocresol | ||
| Dec 27, 2021 at 23:41 | history | became hot network question | |||
| Dec 27, 2021 at 23:38 | answer | added | Nicolau Saker Neto | timeline score: 6 | |
| Dec 27, 2021 at 23:36 | answer | added | Karsten♦ | timeline score: 6 | |
| Dec 27, 2021 at 22:12 | vote | accept | Bernhard Werner | ||
| Dec 27, 2021 at 22:12 | |||||
| Dec 27, 2021 at 20:13 | answer | added | ACR | timeline score: 6 | |
| Dec 27, 2021 at 19:43 | comment | added | Ed V | In introductory chemistry courses, students may be introduced to a tiny quantum mechanics section, which includes the particle in a box solution of the Schrodinger equation. Then beta-carotene, with its conjugated double bonds, is modeled as a particle in a box. What could be sadly misleading later on? ;-) | |
| Dec 27, 2021 at 18:49 | answer | added | Snijderfrey | timeline score: 7 | |
| Dec 27, 2021 at 18:12 | comment | added | Bernhard Werner | Beta-carotine having broad absorbtion is exactly the point that confused me! It has to be that way to appear orange and the linked measurements confirm it. But looking at explanations how pigments such as beta-carotene get their colour, I only ever find the argument that the single HOMO-LUMO jump is responsible. | |
| Dec 27, 2021 at 16:50 | review | Close votes | |||
| Jan 2, 2022 at 3:06 | |||||
| Dec 27, 2021 at 16:07 | comment | added | Ed V | By the way, beta-carotene has broad absorbance, so it does not really support your query about what would happen if a narrow absorbance removed just a narrow band of wavelengths from a white light source. An example of narrow band absorbances in the visible is here. And the color of the holmium chloride aqueous solution dramatically changes, depending on the source of the illuminating light: white LED lamp, white fluorescent lamp or sunlight. So, not so simple. | |
| Dec 27, 2021 at 15:57 | comment | added | Ed V | Nice interactive link for beta-carotene! So it absorbs pretty much all light below about 510 nm, which means it transmits, from incident white light, red, orange, yellow and green. Then the color we perceive depends on our eyes: most of us are trichromats, some people have one of the color blindnesses, etc. | |
| S Dec 27, 2021 at 15:33 | review | First questions | |||
| Dec 27, 2021 at 16:45 | |||||
| S Dec 27, 2021 at 15:33 | history | asked | Bernhard Werner | CC BY-SA 4.0 |