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Spectroscopy

Spectroscopy is a branch of analysis devoted to identifying elements and compounds through the measurement of the absorption, scattering, or emission of electromagnetic radiation by atoms or molecules. It is widely used in physical and analytical chemistry, as well as in astronomy and remote sensing. Questions and answers here have to do with anything that has to do with Spectroscopy.

513 Questions

What is Aston's mass spectrograph?

The Aston mass spectrograph is a device that separates isotopes of an element based on their mass-to-charge ratio. It was pioneered by Francis William Aston in the early 20th century and played a crucial role in the development of modern mass spectrometry techniques.

What are the social implications of the electromagnetic spectrum?

One social implication arising from the electromagnetic spectrum comes in the form of X-rays. X-rays have the potential of causing genetic damage and cancer. However, the chances of being harmed by medical or dental X-Rays are very slim. In fact, natural radiation poses a bigger risk.

Does infrared absorption make a molecule travel faster?

No, infrared absorption does not make a molecule travel faster. Infrared absorption results in the excitation of molecular vibrations, which can lead to changes in molecular conformation or reactivity, but it does not affect the overall speed of a molecule.

What are the units and symbol for dipole moment?

The unit for dipole moment is represented in Debye (D). The symbol for dipole moment is "μ" (mu).

What is significance of dipole moment?

Dipole moment is the measure polarity of a polar covalent bond .

In language of physics it can be defined as the measure of strength of electric dipole. It is defined as the product magnitude of charge on the atoms and the distance between the two bonded atoms. Its common unit is debye and SI unit is coulomb metre.

The magnitude of dipole moment is equal to the product of either charge and the distance between the charges and its direction is from -q to +q.It is directed from the (-)ve charge to the (+)ve charge.In fact, it is the behavior of a dipole.


A separation of charge forming a positive and a negative end of a molecule ~APEX

Difference between forbidden and allowed transitions?

Forbidden transitions are transitions in a physical system that are not allowed according to selection rules, usually due to conservation laws or symmetry considerations. Allowed transitions are transitions that are permitted by the selection rules and can occur in a given physical system.

What is the difference between laser diffraction and ordinary light diffraction?

Laser diffraction involves the use of a laser beam to analyze particle size distribution, providing more accurate and precise results compared to ordinary light diffraction. On the other hand, ordinary light diffraction uses a broader spectrum of light, making it less specific and more prone to errors in measurement. Laser diffraction typically has a higher resolution and can detect smaller particle sizes than ordinary light diffraction.

What would happen if a blue filter was used for spectroscopy?

Using a blue filter for spectroscopy would selectively transmit blue wavelengths of light while blocking other wavelengths. This would result in the spectrograph only detecting and recording blue light emitted or absorbed by the sample being analyzed, leading to a limited spectral range in the data collected.

What is red solution in uv spectroscopy?

In UV spectroscopy, a red solution could indicate the presence of a compound that absorbs light more in the visible range rather than in the UV range. This could be due to the presence of colored impurities in the sample or the compound itself having strong absorbance in the visible region. Further analysis, such as UV-Vis spectroscopy, can provide more information on the specific properties of the red solution.

Visible light occupies which position in which part of the electromagnetic spectrum?

Visible light occupies the middle position in the electromagnetic spectrum, between infrared and ultraviolet radiation. This part of the spectrum is the only range of electromagnetic waves that can be detected by the human eye.

Why is sound not part of the electromagnetic spectrum?

Sound is a mechanical wave that requires a medium, such as air or water, to propagate. Electromagnetic waves, on the other hand, do not require a medium and can travel through a vacuum. This fundamental difference in how they travel means that sound is not considered part of the electromagnetic spectrum.

Is the first order spectra wider than the second order spectra in a diffraction grating experiment?

Yes, the first order spectra is typically wider than the second order spectra in a diffraction grating experiment because the diffraction angle for higher orders (such as second order) is smaller, resulting in a narrower spread of the spectral lines.

Difference between FTIR and IR?

IR deals with spectra itself and almost without any processing. FTIR transforms IR spectra using Fourier transformation which allows to find very specific frequencies (each element has its own FTIR spectra).

Why Glycerin is not visible when kept in Glass bottle?

Glycerin is a clear, colorless liquid with a high refractive index, which means it bends light strongly. When glycerin is in a glass bottle, light passes through the liquid and glass without being scattered, resulting in glycerin being virtually invisible.

Is hydrogen light a monochromatic source?

Hydrogen light is not completely monochromatic as it consists of multiple spectral lines. However, the most prominent and widely used line is the hydrogen-alpha line at a wavelength of approximately 656.3 nm, which is often used in astronomy and other scientific applications.

WHAT FRANK-condon principle says with respect to spectroscopy?

The Franck-Condon principle states that in a molecular electronic transition, the nuclei of the molecules will remain in the same vibrational state before and after the transition. This principle is important in spectroscopy as it explains the intensity and shape of spectral lines. It allows for the determination of relative energies of electronic states and can provide insight into molecular structure and bonding.

How does the brightness of a light bulb relate to the wavelengths of light produced by the bulb?

The light bulb gives light be heating the filament. Roughly speaking, it is emitting black body radiation. Plank's Law gives you the formula.

See here:

http://en.wikipedia.org/wiki/Black_body

http://en.wikipedia.org/wiki/Planck's_law

Mass in an object is describing what other form of matter?

Mass in an object describes the amount of matter contained within the object.

Physical significance of magnetic dipole moment?

The magnetic dipole moment represents the strength and orientation of a magnetic field produced by a current loop or a magnet. It is a measure of the ability of an object to interact with an external magnetic field. This property is fundamental in understanding the behavior of magnetic materials and the interactions between magnetic objects.

Why are microwave spectra difficult to be observed in case of solids and liquids?

Microwave spectra are difficult to observe in solids and liquids because these materials have broad spectral lines due to molecular motion, rotation, and interactions that are faster and more complex than in gases. This results in overlapping and obscured peaks in the spectrum, making interpretation challenging. Additionally, the high dielectric constant of solids and liquids can also lead to signal attenuation and distortions in the microwave spectra.

What is the basic principle of raman spectroscopy?

Raman spectroscopy is based on the inelastic scattering of light, where photons interacting with a sample undergo energy exchange, resulting in shifts in wavelength that can be used to identify molecular vibrations. By analyzing these shifts, information about molecular composition and structure can be obtained.

Does a spectrum really contain 7 colors?

The visible spectrum of light contains a continuous range of colors, but humans perceive it as seven distinct colors: red, orange, yellow, green, blue, indigo, and violet. The categorization into seven colors is a result of how our eyes and brains interpret different wavelengths of light.

What happens when you mix red light and blue light?

When red light and blue light are mixed together, they can create the perception of purple light. This is because red and blue light are at opposite ends of the visible light spectrum, so mixing them can stimulate the appropriate cone cells in our eyes to perceive them as a new color.

What is the focal length of a rectangular glass slab?

The focal length of a rectangular glass slab is not applicable as it does not have the ability to converge or diverge light to form an image. The primary function of a glass slab is to refract light without focusing it at a specific point.

Sound is not part of the electromagnetic spectrum because?

because sound waves are not a electromagnetic waves because they need a medium for travel....hence electromagnetic spectrum is based on the electromagnetic waves ..like radio waves , micro waves , etc....