IGNOU MCH-020 Assignment 2026-27
Atomic and Molecular Spectroscopy
Last updated by IGNOU: 10 Jul 2026. Guide written from the official PDF on 13 Nov 2026, 08:55 am.
December 2026 term-end exam
Thu, 03 Dec 2026 · Morning (10:00 AM – 1:00 PM)
From IGNOU's official date sheet dated 30 Oct 2026. IGNOU can still revise it: check your hall ticket for the final date and your exam centre.
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Make the MCH-020 assignment front page →| Course code | MCH-020 |
|---|---|
| Course title | Atomic and Molecular Spectroscopy |
| Programme | M.Sc. in Chemistry Programme (MSCCHEM)MSCCHEM |
| School | School of Sciences |
| Assignment code | MCH-020/TMA/2026-27 |
| Session | July 2026 and January 2027 |
| Maximum marks | 100 |
| Weightage | 30% |
| Last date (June exam) | 31 Mar 2027 |
| Last date (December exam) | 31 Oct 2026 |
| Medium | English |
| Term-end exam (December 2026) | Thu, 03 Dec 2026, Morning (10:00 AM – 1:00 PM) |
About the MCH-020 assignment
The MCH-020 tutor-marked assignment covers all four blocks of Atomic and Molecular Spectroscopy. Topics include rotational, vibrational, Raman, NMR, ESR and Mössbauer spectroscopy.
The assignment has 10 compulsory questions, each with multiple parts, for a total of 100 marks. It includes explanations, diagrams, derivations and numerical calculations. A score of 40% is needed to pass.
What the assignment asks
| Question | Marks | Topic |
|---|---|---|
| Q1 | 5 + 5 | Calculate photon energy from wavelength and express Lambert’s law mathematically. |
| Q2 | 5 + 5 | Discuss angular momentum and magnetic quantum numbers, and explain the conditions for linear and quadratic Stark effects. |
| Q3 | 5 + 5 | Interpret the relative positions and intensities of lithium and beryllium 2s peaks, and illustrate BF3 rotation as an oblate symmetric top. |
| Q4 | 5 + 5 | Calculate an isotopically shifted rotational band for DF and the zero-point energy and force constant of HCl. |
| Q5 | 5 + 5 | Explain anharmonic oscillation and its allowed transitions, then discuss Fermi resonance and derive the frequency of a hot band. |
| Q6 | 5 + 5 | Calculate Stokes and anti-Stokes Raman wavenumbers and illustrate coherent anti-Stokes Raman spectroscopy. |
| Q7 | 5 + 5 | Outline how to determine the specified molecular term symbols and calculate dissociation energies for excited-state HF. |
| Q8 | 5 + 2 + 3 | Discuss fluorescence quenching, the structural use of the nuclear Overhauser effect and the number of carbon-13 NMR signals in the listed compounds. |
| Q9 | 2 + 3 + 3 + 2 | Calculate Mössbauer recoil quantities, derive a quadrupole splitting scheme, identify a radical from its ESR spectrum and explain anisotropy in the ESR g value. |
| Q10 | 5 + 5 | Explain the origin of the nuclear Overhauser effect and predict the ESR line pattern for the specified molybdenum complex. |
This is a summary of each question. Download the official PDF above for the exact questions and word limits.
How to write and submit it
- Answer all questions and keep responses precise.
- Use foolscap-size paper that is not very thin, leaving approximately 4 cm margins at the left, top and bottom.
- On the first page, give your enrolment number, name, address, course code and title, assignment number, study centre name and code, and date.
- Submit the complete answer sheets to your study centre by the applicable due date; late submissions are not accepted.
- Keep a copy of your answer sheets.
- Submit the assignment before filling in the examination form for this course.
- The booklet is valid from July 2026 to June 2027; if you fail or do not submit it by June 2027, obtain a new assignment and follow the Programme Guide.
Submission dates: 31 March 2027 (June term-end exam); 31 October 2026 (December term-end exam). Dates can differ by session.
Frequently asked questions
What is the assignment code for MCH-020?
The assignment code is MCH-020/TMA/2026-27.
How many marks and what weightage does the assignment carry?
The assignment carries 100 marks and has a 30% weightage in continuous evaluation.
How many questions must I answer?
All 10 questions are compulsory.
What are the submission dates for the assignment?
The listing gives 31 October 2026 for the December term-end exam and 31 March 2027 for the June term-end exam. Dates can differ by session.
Where should I submit the MCH-020 assignment?
Submit the complete answer sheets to your study centre by the applicable due date.
Can I fill in the examination form before submitting the assignment?
No. The booklet says the assignment must be submitted before you fill in the examination form for this course.
Other IGNOU MSCCHEM assignments
- MCH-011: Inorganic Chemistry 1
- MCH-016: Inorganic Chemistry 2
- MCH-019: Green Chemistry
- MCHE-013: Supramolecular Chemistry
- MCHE-015: Advanced Kinetics and Electrochemistry
Assignment details and PDFs come from IGNOU's official website; the guide is a summary of the official PDF. Always check the latest instructions and last dates on ignou.ac.in or with your Regional Centre before submitting.