chapt 24

10問 • 8ヶ月前

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問題一覧

Which of the following is a prerequisite for a sample to be ESR-active?

B. Presence of unpaired electrons

In ESR spectroscopy, the g-factor of a free electron is approximately:

C. 2.0023

How does electron shielding affect the magnetic field experienced by a nucleus in MRS?

B. It decreases the effective magnetic field, leading to upfield shifts

What is the primary condition for a nucleus to be observable in NMR spectroscopy?

C. The nucleus must have a non-zero magnetic dipole moment (i.e., spin quantum numberl/=0)

What is the main advantage of Fourier Transform NMR over continuous-wave NMR?

C. It enables faster acquisition and higher signal-to-noise ratio through signal averaging

In a uniform external magnetic field BO, the magnetic dipole moment u of a nucleus undergoes which type of motion?

D. Precession around the magnetic field direction

In Nuclear Magnetic Resonance (NMR), what causes the energy difference between nuclear spin states in a magnetic field?

C. The Zeeman interaction between the magnetic dipole and the external magnetic field

In NMR, the chemical shift of a nucleus is primarily caused by:

C. Shielding/deshielding effects from surrounding electrons

In the presence of an external magnetic field, how does the magnetic dipole moment of a nucleus behave over time?

C. It precesses around the direction of the external magnetic field

Why are electrons more sensitive than nuclei in magnetic resonance techniques?

B. Electrons have larger magnetic moments and thus interact more strongly with magnetic fields

biochem

biochem

inorg

inorg

phychem

phychem

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問題一覧

Which of the following is a prerequisite for a sample to be ESR-active?

B. Presence of unpaired electrons

In ESR spectroscopy, the g-factor of a free electron is approximately:

C. 2.0023

How does electron shielding affect the magnetic field experienced by a nucleus in MRS?

B. It decreases the effective magnetic field, leading to upfield shifts

What is the primary condition for a nucleus to be observable in NMR spectroscopy?

C. The nucleus must have a non-zero magnetic dipole moment (i.e., spin quantum numberl/=0)

What is the main advantage of Fourier Transform NMR over continuous-wave NMR?

C. It enables faster acquisition and higher signal-to-noise ratio through signal averaging

In a uniform external magnetic field BO, the magnetic dipole moment u of a nucleus undergoes which type of motion?

D. Precession around the magnetic field direction

In Nuclear Magnetic Resonance (NMR), what causes the energy difference between nuclear spin states in a magnetic field?

C. The Zeeman interaction between the magnetic dipole and the external magnetic field

In NMR, the chemical shift of a nucleus is primarily caused by:

C. Shielding/deshielding effects from surrounding electrons

In the presence of an external magnetic field, how does the magnetic dipole moment of a nucleus behave over time?

C. It precesses around the direction of the external magnetic field

Why are electrons more sensitive than nuclei in magnetic resonance techniques?

B. Electrons have larger magnetic moments and thus interact more strongly with magnetic fields