someHerrings
Visible Raman Scattering: 532nm 100mW laser through Muriatic Acid
Shown here is the effect of shining a green laser beam through muriatic acid (HCl and water). The scattered red 650nm glow is a result of O-H stretching seen as a 3450cm-1 energy shift from the incident 532nm laser.
The chlorine anion increases the polarizability of the water which intensifies the 3450cm-1 shift.
Photographed through magenta laser protection goggles.
"The differences in the hydrogen-bonded stretching of the IR and Raman spectra of the acid solutions can be attributed to the different selection rules. For a mode to be Raman active, there must be a change in polarizability with the vibration. As acids with increasingly polarizable anions (Cl - < Br - < I - ) are added, the water molecules solvating these anions exhibit increased polarizability; thus, since Raman intensities arise from this condition, this effect is observed in the Raman spectra."
See:
www.researchgate.net/figure/231641619_fig2_Figure-3-Isotr...
This effect was also seen in a saturated saline solution although it wasn't nearly as bright.
See:
www.researchgate.net/publication/45707038_Experimental_St...
Lecture on vibrational spectroscopy:
131.104.156.23/lectures/CHEM_207%20copy/vibrational_spect...
Visible Raman Scattering: 532nm 100mW laser through Muriatic Acid
Shown here is the effect of shining a green laser beam through muriatic acid (HCl and water). The scattered red 650nm glow is a result of O-H stretching seen as a 3450cm-1 energy shift from the incident 532nm laser.
The chlorine anion increases the polarizability of the water which intensifies the 3450cm-1 shift.
Photographed through magenta laser protection goggles.
"The differences in the hydrogen-bonded stretching of the IR and Raman spectra of the acid solutions can be attributed to the different selection rules. For a mode to be Raman active, there must be a change in polarizability with the vibration. As acids with increasingly polarizable anions (Cl - < Br - < I - ) are added, the water molecules solvating these anions exhibit increased polarizability; thus, since Raman intensities arise from this condition, this effect is observed in the Raman spectra."
See:
www.researchgate.net/figure/231641619_fig2_Figure-3-Isotr...
This effect was also seen in a saturated saline solution although it wasn't nearly as bright.
See:
www.researchgate.net/publication/45707038_Experimental_St...
Lecture on vibrational spectroscopy:
131.104.156.23/lectures/CHEM_207%20copy/vibrational_spect...