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  • Re: Where can I find the gas phase spectrum of Methane

    From Norm Why@21:1/5 to All on Fri Oct 29 21:58:19 2021
    The IR spectrum here:

    https://webbook.nist.gov/cgi/cbook.cgi?ID=C74828&Type=IR-SPEC&Index=1#IR-SPEC



    Notice: Except where noted, spectra from this collection were measured on dispersive instruments, often in carefully selected solvents, and hence
    may differ in detail from measurements on FTIR instruments or in other chemical environments. More information on the manner in which spectra in this collection were collected can be found here.

    Notice: Concentration

    is bizarre.

    I have never believed the alarmists claims about cow farts, etc. Alarmists claims are always wrong.

    Is Methane black!!!???

    Methane has no permanent dipole moment and it is symmetrical. I would think
    it is no more a greenhouse gas than Helium. Is Helium a greenhouse gas? Is Helium black?

    --- SoupGate-Win32 v1.05
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  • From Norm Why@21:1/5 to All on Fri Oct 29 22:08:16 2021
    The IR spectrum here:

    https://webbook.nist.gov/cgi/cbook.cgi?ID=C74828&Type=IR-SPEC&Index=1#IR-SPEC



    Notice: Except where noted, spectra from this collection were measured on
    dispersive instruments, often in carefully selected solvents, and hence
    may differ in detail from measurements on FTIR instruments or in other
    chemical environments. More information on the manner in which spectra in
    this collection were collected can be found here.

    Notice: Concentration

    is bizarre.

    I have never believed the alarmists claims about cow farts, etc.
    Alarmists claims are always wrong.

    Is Methane black!!!???

    Methane has no permanent dipole moment and it is symmetrical. I would
    think it is no more a greenhouse gas than Helium. Is Helium a greenhouse
    gas? Is Helium black?

    This appears to be the IR Spectra of pure liquid Methane. Morons want to
    scare us and control the world.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Norm Why@21:1/5 to All on Fri Oct 29 21:48:25 2021
    The IR spectrum here:

    https://webbook.nist.gov/cgi/cbook.cgi?ID=C74828&Type=IR-SPEC&Index=1#IR-SPEC



    Notice: Except where noted, spectra from this collection were measured on dispersive instruments, often in carefully selected solvents, and hence may differ in detail from measurements on FTIR instruments or in other chemical environments. More information on the manner in which spectra in this collection were collected can be found here.

    Notice: Concentration

    is bizarre.

    I have never believed the alarmists claims about cow farts, etc. Alarmists claims are always wrong.

    Is Methane black!!!???

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Norm Why@21:1/5 to All on Fri Oct 29 22:43:46 2021
    Bloomberg Green: The Dangers of Methane Gas https://www.youtube.com/watch?v=b5VDMyYPyfs

    Is a propaganda site.
    the following comment was implanted there and it was immediately removed.


    https://webbook.nist.gov/cgi/cbook.cgi?Scan=cob8873&Type=IR

    is IR spectrum of pure cold liquid methane with all its isotopomers; CH3D, CH2D2,CHD3, CD4. CH4 methane is in the middle. CH4 a symmetric molecule has
    no permanent dipole moment and has no IR spectrum.

    Once again it is shown morons are in charge of the planet.

    Be prepared to be inundated with propaganda from criminal fraudsters.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Martin Brown@21:1/5 to Norm Why on Sat Oct 30 09:15:23 2021
    On 30/10/2021 05:58, Norm Why wrote:
    The IR spectrum here:

    https://webbook.nist.gov/cgi/cbook.cgi?ID=C74828&Type=IR-SPEC&Index=1#IR-SPEC



    Notice: Except where noted, spectra from this collection were measured on
    dispersive instruments, often in carefully selected solvents, and hence
    may differ in detail from measurements on FTIR instruments or in other
    chemical environments. More information on the manner in which spectra in
    this collection were collected can be found here.

    Notice: Concentration

    is bizarre.

    I have never believed the alarmists claims about cow farts, etc. Alarmists >> claims are always wrong.

    Is Methane black!!!???

    Methane has no permanent dipole moment and it is symmetrical. I would think it is no more a greenhouse gas than Helium. Is Helium a greenhouse gas? Is Helium black?

    Moron! A comparison of your intellect with two short planks would be
    insulting to the planks. All polyatomics with 3 or more atoms are
    potential GHGs irrespective of whether they have a dipole moment or not.

    Think about the vibrational degrees of freedom and you might see why.

    Helium is monatomic and plays no part as a GHG and so is argon which
    makes up nearly 1% of the Earth's atmosphere.

    Nitrogen and oxygen are so tightly bonded together that their
    vibrational frequencies are way beyond thermal IR bands on Earth.

    CO2 and H2O are the canonical simplest common greenhouse gasses. They
    have several vibrational modes with frequencies in the right ballpark.

    Any polyatomic gas has resonant frequencies that are in the right range
    to absorb (and emit) thermal band IR on the Earth.

    The most extreme GHG and also one of the most stable is SF6 which has
    been considered as a possibility for terraforming Mars. It is used in electrical switchgear and ultra high voltage accelerators.

    https://www.forbes.com/sites/thebakersinstitute/2021/03/25/sf6-the-little-gas-that-could-make-global-warming-worse/?sh=3dac86c022ad

    --
    Regards,
    Martin Brown

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  • From [email protected]@21:1/5 to Martin Brown on Sat Oct 30 07:55:15 2021
    On Saturday, October 30, 2021 at 2:15:28 AM UTC-6, Martin Brown wrote:

    Nitrogen and oxygen are so tightly bonded together that their
    vibrational frequencies are way beyond thermal IR bands on Earth.

    Minor correction: Actually, the real reason that nitrogen and oxygen don't absorb in the IR is that they have a dipole moment of zero, and that can't change as they vibrate because of their very simple symmetry. The selection rule for IR-active modes is
    that the dipole moment has to change during a vibration.

    To the people asking questions about whether methane is black: irrelevant. You can't see in the infrared, so you can't judge IR absorption by looking. Put it another way: the atmosphere is transparent in the visible range, and yet the surface of the
    Earth is much warmer than it would be without our atmosphere. So the visible color of atmospheric gases clearly can't play a role in the greenhouse effect.

    If I may be permitted to editorialize for a moment, I would say that what we are seeing here is the heart of the problem. The people who are most convinced that global warming is a hoax are those people least able to explain the physics behind it. I have
    yet to meet a person with these views who can give a reasonable account of the planet's heat balance. It's not extremely complicated. I teach it to my first-year students. It's also not completely trivial. There are lots of great resources out there,
    notably this one from the American Chemical Society (since this is sci.chem): https://www.acs.org/content/acs/en/climatescience.html. Learn, then maybe you can ask sensible questions.

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