Types of Spectroscopy |Atomic and Molecular | Absorption and Emission | Spectroscopy Principle | ZCC

[@gopalkrishna5064]

thanks for explaining this in such a easy way ...... i was finding this topic difficult for years it helped

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Very informative and helpful vedio about spectroscopy

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Thank you so much sir, this was much needed explanation before my exams

[@zerocramchemistry1610]

Glad you found it helpful!

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Super lecture sir too much helpful to clear all concepts🎉🎉

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Masha Allah 💖 Thanks Sir for such a platform

[@ibrarahmad8925]

Thanks sir for such a platform

[@zainabsharif2886]

Sir in molecular emission spectroscopy why we use 2 monochromators?

[@zerocramchemistry1610]

Actually one monochromator will be used for selecting or filtering light for excitation and other monochromator for filtering the light emitted exactly by the sample itself. Emitted light is slightly high in wave number or low in energy as some amount of light get desipated in other forms of energy such as vibrations of molecules etc.

[@zainabsharif2886]

But sir why we didn't use 1 monochromator for both excitation and filtrating of light.

[@zerocramchemistry1610]

@@zainabsharif2886 actually with single monochromator either you can use it for filtering either excitation signal or for emission signal. Both processes can't be carried out at the same time. 2nd excitation signal or energy required for absorption is different then energy emitted during emission. As during emission some part of energy is dissipated in other energy forms along with light such energy consumed in molecular vibrations or heat energy. So emitted light is slightly less in energy (emitted signal) then energy absorbed (excitation signal). Therefore due to this slight difference in energy we use different monochromators and they are set at different filtering wavelengths.

[@sidchemist933]

Allah Almighty will continue to favour you and crown all your efforts with success.With many thanks Sir. Sidra batool(5015) m.phil chem 2nd semster.

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You made this easy to understand... respected sir Arooj Fatima Msc chemistry semester 1st(E)

[@sharjeelkhankhan9854]

MASHALLHA sir ji 🥰

[@tayybarazaq5079]

In atomic absorption spectroscopy we used hollow cathode lamp as a source of EMR that produce light of exactly same wavelength that an analyte absorbs then why there is need of Monochromator in it?

[@zerocramchemistry1610]

Yes, there is very much need. As we are using flame for production of sample atoms so flame light might interfere. So in order to avoid it we are using monochromator

[@hafizshakoor3308]

Great sir g

[@mariasaif7874]

Sir why we use monochromators in atomic emission spectroscopy. While In atomic emission we measured the amount of light emitted. Then why we need to filter the light by monochromator

[@zerocramchemistry1610]

Actually we have to measure light emitted by sample, but there is also stray light (due to room light or flame, or light emitted by other matrix elements), so we have to filter that light from that of analyte light, so that's why we will use monochromator both in absorption and emission spectroscopy

[@Fatimayunus-h3h]

In atomic absorption spectroscopy...phly sir ap ny kha ..flame not excite the atom...bad ma excitation bi ho rhi ha atom ki ??? ?

[@zerocramchemistry1610]

Excitation occurs inside the flame region because atoms are present inside the flame, however these atoms are excited by light source which is Hollow Cathode Lamp in case of AAS

[@salamatali5371]

Thanks sir g.

[@Tehreem_630]

Sir atomic absorption ma hum hollow cathode lamp as a light source use kr rhy Kay analyte kitni light absorb kr rha lakin atomic emission ma hum alag se koi light source nhi use kr rhy to flame hi as a source consider hoga ?

[@zerocramchemistry1610]

Yes, in Atomic emission flame or plasma energy is used for both atomisation and excitation, while in Atomic absorption we need extra EMR source like HCL to excite the analyte, while flame is used only for atomisation.

[@tayybarazaq5079]

Why only in molecular emission we placed detector perpendicular to the source of light but not in the case of atomic emission?

[@zerocramchemistry1610]

Infact in various instruments of Atomic emission, detector is placed at right angle.

[@tayybarazaq5079]

Thank you very much sir for answering each query i have

[@shoukat394]

Good understanding

[@7_8_6]

Good bless you sir g

[@chemistry10456]

Spectrometry ks type m ay ga I mean molecular or atomic

[@zerocramchemistry1610]

Spectroscopy is of both types, atomic and molecular as well.

[@hafizawaisamjad]

AoA. sir ji kia sary molecules hi vibrational ur rotational energy level show krty hain??

[@zerocramchemistry1610]

Yes only molecules do vibrational and rotational transitions as both vibration and rotation is a relative term and it can be observed only in atoms attached with each other. In a single atom these transitions are absent and only electronic transitions are possible.

[@raotoqeermurtaza173]

Asslam o Alikum Sir why we use two monochromators in molecular emission spectroscopy...?

[@zerocramchemistry1610]

In order select both absorption and emission signal only for analyte. In case of emission we first do excitation by first inducing absorption signal. So to send exact that light for which only our analyte excites we have to send very particular light and for that we use absorption monochromator. Similarly after absorption next step is emission. So sample emit light and we want to measure just that light rather than other stray light. So we use emission monochromator just to record that particular light.

[@raotoqeermurtaza173]

@@zerocramchemistry1610 thank you Sir. Clear now each and everything😍

[@tayybarazaq5079]

Assalam o alaikum Sir; Sir in absorption spectroscopy detector detects either light absorbed by analyte or transmitted light and then take the difference between light source and transmitted light if detector detects absorbed light then how?

[@zerocramchemistry1610]

In easy words Detectors detect change in intensity of light or EMR reaching to it.

[@muhammadrasheed3368]

JazakALLAH Sir Gg

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5105 MSc Chemistry semester-4 Great effort...easy to learn👍

[@farahismail2119]

Respected sir send link of NMR techniques (Resonant frequency &Acquision spectra)

[@zerocramchemistry1610]

Actually current focus is on Analytical and Inorganic topics. NMR is more inclined towards organic, however I will try to focus on NMR as well, but in the future InshaAllah

[@kelseymallow8428]

Hello sir I have a question, what are the parts/components used in molecular emission spectroscopy? hoping for ur response asap

[@zerocramchemistry1610]

Actually Fluorescence and Phosphorescense is included in Molecular Emission Spectroscopy. As our sample remains already in molecular form so we don't need any source of heating. Other components remain pretty much same.

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Great

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