Photonics lecture 1

The energy of atoms and molecules is...

• quantized

• constant

• continuous

The transition between the energy states of atoms and molecules is possible

• only smoothly (плавно)

• only abruptly (скачкообразко)

• both smoothly and abruptly

Can two different elements have the same emission spectrum?

• Yes

• No

• Only if they are in the same group in the periodic table

Visible and ultraviolet spectroscopy provides information ...

• about vibrational and rotational energy levels

• about electronic transitions

• about orbital and spatial structure

Infrared spectroscopy provides information ...

• about vibrational energy levels

• about electronic transitions

• about orbital and spatial structure

What molecular vibrations are inactive in IR spectra?

• Antisymmetric stretching vibrations

• Bending vibrations

• Symmetric vibrations

The anti-Stokes scattering component has a wavelength which is ... the wavelength of the incident light

• smaller than

• larger than

• the same as

Due to a symmetric stretching vibration of a molecule, ...

• bands appear in Raman spectra

• bands appear in IR spectra

• bands appear in Raman spectra and in IR spectra

Raman scattering ...

• is elastic

• occurs with a change in the wavelength of light

• occurs without changing the wavelength of light

What is characteristic of atomic spectroscopy?

• Large sample volume is required

• High sensitivity

• It determines about 40 chemical elements