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 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.
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
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
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?
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
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
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.
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 ?
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.
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.
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?
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.
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
Please press the LIKE button on the video, if you understood the lecture. This will help to propagate the lecture to more and more viewers. Best Regard.
thanks for explaining this in such a easy way ...... i was finding this topic difficult for years it helped
Very informative and helpful vedio about spectroscopy
Super lecture sir too much helpful to clear all concepts🎉🎉
Masha Allah 💖
Thanks Sir for such a platform
Thank you so much sir, this was much needed explanation before my exams
Glad you found it helpful!
Thanks sir for such a platform
MASHALLHA sir ji 🥰
Great sir g
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.
Good understanding
JazakALLAH Sir Gg
Good bless you sir g
You made this easy to understand... respected sir
Arooj Fatima Msc chemistry semester 1st(E)
Thanks sir g.
Sir in molecular emission spectroscopy why we use 2 monochromators?
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.
But sir why we didn't use 1 monochromator for both excitation and filtrating of light.
@@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.
Great
5105 MSc Chemistry semester-4
Great effort...easy to learn👍
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
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
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?
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
Muhammad RIZWAN nice sir ji
In atomic absorption spectroscopy...phly sir ap ny kha ..flame not excite the atom...bad ma excitation bi ho rhi ha atom ki ??? ?
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
AoA. sir ji kia sary molecules hi vibrational ur rotational energy level show krty hain??
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.
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 ?
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.
Spectrometry ks type m ay ga I mean molecular or atomic
Spectroscopy is of both types, atomic and molecular as well.
Why only in molecular emission we placed detector perpendicular to the source of light but not in the case of atomic emission?
Infact in various instruments of Atomic emission, detector is placed at right angle.
Thank you very much sir for answering each query i have
Excellent video
M.Ejaz Abdul Qayyum
M.sc chemistry 1st semester evening
Sobia Abdul Ghaffar msc chemistry semester 1 very interesting leactur
Thanks sir
Interesting lecture and easy to understand because of your explanation thank you sir
Saima saleem 1035 BS chemistry 5th semester morning
Asslam o Alikum
Sir why we use two monochromators in molecular emission spectroscopy...?
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.
@@zerocramchemistry1610 thank you Sir. Clear now each and everything😍
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?
In easy words Detectors detect change in intensity of light or EMR reaching to it.
Arooj Fatima (5025)
Msc Chemistry (Eve)
3rd semester
Thanks for this kindness sir
Great sir g👍👍👍 keep it up.... Sir plz industrial chemistry jo k 4th smEster me outline prhai jati hy us k lectures b prepare kr dain plz.
Kainat-1011 BS-Chem 7th Morning
Analytical paper-1
JazakAllah sir
Hello sir I have a question, what are the parts/components used in molecular emission spectroscopy? hoping for ur response asap
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.
th-cam.com/video/Qg8jBUi7V-c/w-d-xo.htmlsi=sFMm-Rq0TypJfWmq
th-cam.com/video/jqpZnpvgbDs/w-d-xo.htmlsi=S1Put_mPA4IRdXgq
th-cam.com/video/C01P5GdZq-s/w-d-xo.htmlsi=bzEzJan65an_co99
th-cam.com/video/_RSYspY6QT8/w-d-xo.htmlsi=OvGIcSwZNaVdy8vS
MS-F 20 - 5005- Eve- Ahtisham Ali
Respected sir send link of NMR techniques (Resonant frequency &Acquision spectra)
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
Muhammad Ehsan Elahi Zaheer
1026
Chemistry
Hafiz Muhammad Zaeem Alam Askari
M.sc Chemistry 5th semester
Iqra Akram bs 5th evening
Noor Fatima Msc chemistry 1st smster
3004-syed zulqernain BS Chemistry 5th-E
NASREEN ASHRAF-1006-BS-CHEM-7th-SEMESTER-MORNING!
Fatima Arif 1031 BS Chemistry 7th Morning
Samia Fatima
Msc chemistry semester 1 (evening)
Saira mehboob Msc chemistry evening ( ist semester)
Saba Anwar 1024 Bs chemistry 7th analytical morning 19-23
Informative lecture
👏👏👏👏👏
Rashida Jamil
1006
M.phil chem
Rabia Hameed msc semester 1
Sir am not understanding the the energy levels now am going to cry 😭
5004
MPhil chemistry (E)
Syed Muhammad Ali Trimzi
2nd semester M. Phil chemistry (M)
Session 2020-22
Ghulam Mujtaba Ahmad BS chemistry evening 5th
3005- Uzair Majeed 5th Evening
3030-M Usman Mudassar-Bs Chemistry-5th -Evening
Mudassra Ehsan 5007 M.Phil evening ....2nd semester
Tayyaba Batool 5024
MS Chemistry (E)
Allah Maufi
Roll.No.5033
To much interesting lecture
Thank you so much respected sir 🥰
Humaira Sadaf 1011
BS chemistry 5th [M]
Well explained 🌸
Very informative lecture and easy to understand
Fiza Haq
1005
BS Chemistry 5th semester Morning
Muqaddas Manzoor -1040-Bs(Chemistry)-5th-Morning
Javeria Shoukat 1022
MPhil Chemistry (M) 2 sem.
محمد عامر عباس 1043..بی ایس کیمسٹری 7th (مورننگ)
Muhammad Aneeb Msc Chemistry 1 semester evening
Usama Bin Zubair MSC-CHEM-5005 Analytical smester 4
Fatima Tahira 5006
BS chemistry 7th semester (Eve)
Analytical Chemistry.
AQSA RIAZ 1045
BS Chemistry Morning
7th semester
Muhammad Parvez 1039 bs chemistry 5th morning
Thanks a lot dear teacher 😊
Arslan Ahmed Msc chemistry semester 1
Please press the LIKE button on the video, if you understood the lecture. This will help to propagate the lecture to more and more viewers. Best Regard.
Safia Atta 1036.BS HON's Chemistry 7th M (Analytical Chemistry)
Malaika muskan 1006 BS Chemistry 5th semester (M)
Aleena Zahid
1021
MS (Chemistry) 2nd semester
3023, zunaira Afzal, Bs 7th evening
Adil Ali-1049-5th smester-morning-bs chem
Ayesha Akbar from msc Chemistry evening
Zabeeh ullah msc chemistry 1st semester evening
Nida Nasir khan 5029
M.Phil Chemistry 2nd (E)
3019 - Zainab Amin Bs chemistry 5th evening
Fatima Tahira 5006
BS Chemistry 5th Smester
Group (Eve). A
1029 Bs-chem 5M
Faiza Iram 5049
BS Chemistry 5th semester
Evening Sec-B
Sadia Ghafoor 1054 5th Morning
Maryam Munir 1049, Morning, 5th Semester , BS Chemistry Session (2019-23)
Misbah Kanwal-3041-BS(Chemistry)5th-Eve
Tehmina shakir_1045_Bs chemistry_5th semester MoRning...
Muhammad Awais Afzal
Roll # 5011
M.Phil Chemistry (Self Support)
2nd Semester
Aqsa Siddique
Roll #1031
BS Chemistry 5th semester Morning
Respected Sir! Your expertise in teaching has put our minds at ease.
Nida khalil
1029 M.phil chemistry (Morning) 2nd semester.
Session 2020_22.
Waleed Khalid BS chemistry 5th E
M.kashif Javaid
3021 Evening 5th semester
Shafaq iqbal 1002 bs chemistry 5 morning
Asad Mehmood-3020- BS Chemistry5th-E
Amina tufail roll num 3044 bs chemistry 5th evening
M Awais Amjid 5033
semester 5th
section A
Session: 2020-2024
Muhammad Azhar... 1056
BS Chemistry 5th morning
Maria Kiran-1021-Bs Chemistry-7th-Morning
5022, Muzammal Hussain,Mphil 2nd semester (Evening)
Saba Anwar 1024 BS chemistry 5th semester morning
Ali Alyas MPhil Eve 2nd Sem
👍👍👍👍