What are the advantages and disadvantages of decreasing monochromator slit width?

Q: A Raman spectrum of undoped GaAs at room temperature is performed with a 514.5 nm laser. The…

A: Given: Wavelength 1 = 507.1 nm = 507.1 X 10-9 m                                  (Since 1 nm = 10-9…

Q: A spectral line of 48Ti8+ in a distant star was found to be shifted from 654.2 nm to 706.5 nm and to…

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Q: Which of the following is NOT a detector used with HPLC?

A: Light Scattering Detector:  Light scattering detection does not require analytes to have…

Q: Distinguish between voltammetry and amperometry

A: 1) Voltammetry is an analytical technique in which variable potential is applied to the working…

Q: what is the difference between conventional and electron flow?

A: The electric current is actually flow of electrical charge from negative to positive charge…

Q: Calculate the density of Tungsten(W) with miller indices [1 1 0 ]

A: Given plane is (110). a = 0.3165 nm Since tungsten crystallize in BCC unit cell. Usethe below…

Q: 6. A solution containing 5.75 mg/100 mL of X (335 g/mol) has a transmittance of 41.6% in a 2.0 cm…

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Q: How can band broadening be reduced in HPLC Eddy Diffusion? A. use smaller particles for stationary…

A: HPLC is based on the principle where the sample (analyte) is distributed between a mobile phase…

Q: State the phase rule and what are the merits and demerits of phase rule

A: Answer is explained below.

Q: Why can UV or higher energy radiation not be used for non- destructive spectroscopy of polymer…

A: The frequency of UV radiation ranges from f= 8×1014to 3× 1016Hz .That is the energy E= hv ranges…

Q: Describe the three main mechanisms of delayed fluorescence

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Q: What is doppler effect. If Mg emission wavelength is 175.3 nm at 2500 K, calculate the doppler…

A: When the observer moves relative the wave source, the change in frequency of the wave w.r.t the…

Q: A substance gave a refractive index of 1.3949 and a density of 0.808 at 20°C. The molar refraction…

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Q: What is meant by localized surface plasmon resonance' (LSPR)? Discuss the origin of creation of…

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Q: Many ions form colored solutions when dissolved in water. For example, aqueous Cu2+ solutions are…

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Q: Why should absorbance be less than 2?  Please explain in terms of light transmittance

A: Absorbance A also called the optical density , is the quantity of light absorbed by a solution.

Q: Explain the difference of an operational principle between flame atomic absorption spectroscopy…

A: Flame atomic absorption spectroscopy  Flame atomic emission spectroscopy  Amount of light absorbed…

Q: What is the difference between an absorption spectrum and a standard curve?

A: The difference between an absorption spectrum and a standard curve has to be given,

Q: What are the applications of Controlled-Potential Electrogravimetry?

A: In electrogravimetry, an analyte is quantitatively electroplated or deposited as a solid on cathode…

Q: Calculate the molar refraction of CCl4.when it's density is 1.595gcm3 and refractive index is…

A: Given data set:     Density = d= 1.595 g/cm3     Refractive index = n= 1.4574     Molar mass of CCl4…

Q: Why are wavlength maxima different for UV-Vis and Fluorescence?

A: Any molecule has quantized electronic levels.  These levels differ largely in energy as compared to…

Q: What are the similarities between fluorescence detectors in HPLC and chemiluminescence detectors in…

A: Chromatography detectors are used to detect compounds that are eluted from the chromatography…

Q: 7-2: Why do quantitative and qualitative analyses often require different monochromator slit widths?

A: 7-2 The monochromator is a wavelength selector that is used to select a particular wavelength from a…

Q: β-carotene has a molar absorptivity of 100,000 dm^3 mol^-1 cm^-1 a certain wavelength. Calculate the…

A: Please find the below attachments.

Q: Which of the following statement is incorrect? The quality of grating of the monochromator affects…

A: In the Atomic Absorption Spectroscometer, the following instrumentation is used and their uses are…

Q: A 7.25 x 10-5 M solution of potassium permanganate has a transmittance of 44.1% when measured in a…

A: Beer-Lambert law: Beer-Lambert's law stated that the loss of light intensity when it propagates in a…

Q: The molar absorptivity for aqueous solutions of phenol at 211 nm is 6.17 x 10³ L cm³¹ mol¹. What is…

A: Given,  Molar absorptivity for aqueous solution of phenol = ε = 6.17 x 103 L.cm-1.mol-1  Percentage…

Q: What major impact does reducing film thickness of stationary phase in a wall-coated capillary column…

A: The film thickness in capillary columns are decided based on the type of material to be analyzed.…

Q: 3280 cm-1 to mm

A: The formula for converting between μm and cm-1 is ν ¯λ= 104. Frequency in Infrared Spectrophotometer…

Q: What is doppler effect. If Mg emission wavelength is175.3 nm at 2500 K, calculate the doppler…

A: Doppler Effect occurs when a source and an observer are moving towards each other or moving away…

Q: Explain why the zinc ion should not interfere with absorbance measurements of the copper ion.

A: Interference of Zinc ion in the absorbance measurements of Copper ion.

Q: What are the advantages to using a near-IR excitation source, such as a diode laser (830 nm),…

A: Ans: Near IR Excitation source, the amount of Rayleigh scattering decrease.

Q: Find the concentration of a solution with a transmittance of 0.27 AU and molar absorptivity of 3.65…

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Q: Beer’s law plot is prepared by plotting absorbance vs molar concentration of the absorbing species.…

A: The units for the above given as

Q: Peak or band broadening is more likely to occur in: gradient elution or isocratic elution?

A: Gradient elution and iscratic elution are two different types of liquid chromatography. Both…

Q: Analyze the effect of concentration and path length on the absorption of radiation in UV visible…

A: The relationship between the absorption, concentration, and path length of the solution is expressed…

Q: Will quantitative fluorescence spectroscopy be as sensitive to path length differences in sample…

A: Fluorescence is a type of luminescence caused by photons exciting a molecule, raising it to an…

Q: (a) What is the main difference between a UV-Vis spectrophotometer and a spectrofluorometer? (b)…

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Q: Isoamyl acetate 100 90 80 70 60 50 40 30 20 10 4000 3500 3000 2500 2000 1500 1000 500 wave…

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Q: 10.Which of the following statements regarding double beam spectrophotometers is NOT true? Why?…

A: The double beam spectrophotometer compares the light intensity of two light paths in which one path…

Q: A Dubosq colorimeter consists of a cell of fixed path length and a cell of variable path length. By…

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Q: Describe a practical that shows black surfaces are better emitters than white ones.

A: The black material performs as a perfect absorber of electromagnetic radiation on exposure to it.…

Q: How would the position of a spectral line change as the separation d between the lines of the…

A: The relation between the position of a spectral line from the central maximum and the separation…

Electronic Transitions and Spectroscopy

The term “electronic” connotes electron, and the term “transition” implies transformation. In a molecule, the electrons move from a lower to a higher energy state due to excitation. The two energy states, the ground state and the excited state are the lowest and the highest energy states, respectively. An energy change is observed with this transition, which depicts the various data related to the molecule.

Photoelectron Spectroscopy

Photoelectron spectroscopy (PES) is a part of experimental chemistry. It is a technique used in laboratories that involves projecting intense beams of radiation on a sample element. In response, the element ejects electrons for which the relative energies are measured.