I majored in Chemistry in the year 2012. I couldn't understand much of Infrared radiation and the bonding of molecules. Thanks to this video, it clarified some of my concepts. Our teachers didn't even show the real-life applications. Now, I am a curriculum developer by profession. I strive to include interdisciplinary approaches, correlations, real-world applications, and the use of multiple intelligences to make the lessons interesting.
So for carbon dioxide (CO2) what are the differences in the dipole moments that correspond to quantumized energy that corresponds to the discrete energy steps (Plank number) in the CO2 emit/absorb range of 12.8 to 17.8 microns ? Is it that the carbon nucleus moves a different discrete peak-to-peak distance in its harmonic motion for each transverse electromagnetic radiation wave-length step (the further the peak displacement of the harmonic motion of the carbon nucleus the higher the energy contained in the motion) ? If not then what ? Can the CO2 molecule obtain a certain peak-to-peak motion of the carbon nucleus upon collision and then have it updated to a higher energy state (in N quantum steps) upon further collision, or have its peak-to-peak motion of the carbon nucleus decreased by N quantum steps upon further collision but not decreased to no harmonic motion at all ?
Why don't you teach Raman spectroscopy, the complement instrument to IR spectroscopy? Raman detectors detect the symmetric stretching modes of CO2s 1338cm-1 mode and both N2 and O2s modes (2338 and 1556cm-1 respectively). Raman can also measure all the other gases. Many gases, including all H2O modes, have modes that are both IR and Raman active. Raman spectrometers, via the Boltzmann constant, can also measure the temperature of the gases and so is spectrometer is a thermometer. (By the way, I am an IB economics teacher)
When CO2 absorbs IR radiation, there are two vibrations that results in a change in the dipole moment of the molecule. They are asymmetrical stretching and bending. Symmetrical bending does not result in a change in the dipole moment.
@@MSJChemThe presence of a dipole moment after absorbing IR radiation affects the efficiency of CO2 in absorbing further IR radiation. Molecules with a dipole moment can interact more strongly with electromagnetic radiation, including IR radiation, through dipole-dipole interactions. This can lead to a higher efficiency of absorption compared to molecules without a dipole moment.
@@MSJChem then it must have a radiation holding capacity? CO2 really isnt that strong. You forget how heavy the molecule is too, it cant hang in the upper atmosphere, it sits at a steady mere 3 per cent of its composition and sits closer to the earth's surface.
@@gnightingale No, carbon dioxide is a well-mixed gas due to turbulence in the atmosphere. If the atmosphere were stratified by molecular weight, we'd all suffocate in argon.
Moore doesn't know what he's talking about, and nobody cares about his claim to be a Greenpeace Co-Founder. It doesn't make him any more competent to talk about climate change.
Folks should understand that the word "absorbance" does not mean that the CO2 molecule has absorbed IR in the sense that we would eat and absorb food. IR radiation effects the bond movements of the CO2 molecule, which leads to the diffraction of IR waves.
For the GHG course I'm taking, this is exactly the level of understanding I needed. Thank you!
I majored in Chemistry in the year 2012. I couldn't understand much of Infrared radiation and the bonding of molecules. Thanks to this video, it clarified some of my concepts. Our teachers didn't even show the real-life applications. Now, I am a curriculum developer by profession. I strive to include interdisciplinary approaches, correlations, real-world applications, and the use of multiple intelligences to make the lessons interesting.
Thanks for the feedback.
So for carbon dioxide (CO2) what are the differences in the dipole moments that correspond to quantumized energy that corresponds to the discrete energy steps (Plank number) in the CO2 emit/absorb range of 12.8 to 17.8 microns ? Is it that the carbon nucleus moves a different discrete peak-to-peak distance in its harmonic motion for each transverse electromagnetic radiation wave-length step (the further the peak displacement of the harmonic motion of the carbon nucleus the higher the energy contained in the motion) ? If not then what ? Can the CO2 molecule obtain a certain peak-to-peak motion of the carbon nucleus upon collision and then have it updated to a higher energy state (in N quantum steps) upon further collision, or have its peak-to-peak motion of the carbon nucleus decreased by N quantum steps upon further collision but not decreased to no harmonic motion at all ?
I totally forgot it! Thanks
Why don't you teach Raman spectroscopy, the complement instrument to IR spectroscopy? Raman detectors detect the symmetric stretching modes of CO2s 1338cm-1 mode and both N2 and O2s modes (2338 and 1556cm-1 respectively). Raman can also measure all the other gases. Many gases, including all H2O modes, have modes that are both IR and Raman active. Raman spectrometers, via the Boltzmann constant, can also measure the temperature of the gases and so is spectrometer is a thermometer.
(By the way, I am an IB economics teacher)
It’s not covered in the syllabus so there’s no requirement for students to know it.
I don't understand.
To get the asymmetrical stretching you need IR absorbance but to absorb IR you need asymmetrical stretching?
When CO2 absorbs IR radiation, there are two vibrations that results in a change in the dipole moment of the molecule. They are asymmetrical stretching and bending. Symmetrical bending does not result in a change in the dipole moment.
@@MSJChemThe presence of a dipole moment after absorbing IR radiation affects the efficiency of CO2 in absorbing further IR radiation. Molecules with a dipole moment can interact more strongly with electromagnetic radiation, including IR radiation, through dipole-dipole interactions. This can lead to a higher efficiency of absorption compared to molecules without a dipole moment.
Beautiful. Thank you so much
Glad I could help.
thanks, i needed a simpler answer
So we basically need DIPOLE moment to absorb the IR radiation? Right? And this dipole moment comes from absorbing the IR....
There needs to be a change in the dipole moment when a molecule absorbs IR radiation.
@@MSJChem Oh okay. Got it. Thank you :)
Very helpful thanks :)
Wouldn't the bending and stretching make the carbon dioxide less stable and less likely to stay in the atmosphere?
No, it allows the molecule to absorb IR radiation and therefore act as a greenhouse gas.
@@MSJChem then it must have a radiation holding capacity? CO2 really isnt that strong. You forget how heavy the molecule is too, it cant hang in the upper atmosphere, it sits at a steady mere 3 per cent of its composition and sits closer to the earth's surface.
@@gnightingale No, carbon dioxide is a well-mixed gas due to turbulence in the atmosphere. If the atmosphere were stratified by molecular weight, we'd all suffocate in argon.
You dont explain what happens to the radation and how the heat is absorbed
the vibration is the transfer of energy.
The Truth About Climate Change - Dr. Patrick Moore - Greenpeace Co-Founder
Moore doesn't know what he's talking about, and nobody cares about his claim to be a Greenpeace Co-Founder. It doesn't make him any more competent to talk about climate change.
Folks should understand that the word "absorbance" does not mean that the CO2 molecule has absorbed IR in the sense that we would eat and absorb food. IR radiation effects the bond movements of the CO2 molecule, which leads to the diffraction of IR waves.
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Very helpful thanks :)