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NtaMS 2305

Authored by Szabolcs Csonka

Physics

University

Used 2+ times

NtaMS 2305
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7 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

We apply a bias voltage between the STM tip and sample, because

a voltage is needed to emit electrons from the STM tip
tunneling only occurs at finite bias voltages
to reduce the tunnel barrier and allow higher currents
otherwise tunneling in both directions cancel the current

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What information does an STM image contain?

topography (atomic structure)
local electronic structure (density of states)
a combination of topogrpahy and electronic structure effects
local mechanical properties of samples

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Tunneling spectroscopy provides infomation about

local chemical bond configuration
local electronic desnity of states of the sample
overall electrical conductivity of the smaple
local mechanical properties of samples

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The main advantage of AFM over STM is

faster measuremetns
higher resolution
the ability to investigate electrically insulating samples
smaller tip-sample interactions, less destructive

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The interaction between the AFM tip and sample surface is

always repulsive
always attractive
repulsive at large (tip-sample) distances, attractive at small
attractive at large (tip-sample) distances, repulsive at small

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The main difference between contact, tapping and non-contact AFM measurement modes is

the strenght of the tip-sample interaction
the driving frequency of the tip
the detection mode of the signal
the oscillation amplitude of the tip

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

In tapping or non-contact mode AFM measurements we drive the tip oscillations at

cantilever resonance frequency
away from resonance, to avoid strong vibrations
slightly off-resonance, to achieve maximum sensitivity
does not matter, works well for a wide driving frequency range

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