Microscpe Electronique Flashcards

1
Q

Microscope Électronique :
G = 2*10^6
d = 0,2 nm
Lamda = 0,005 nm
ddp = 100 kV

A

VRAI.

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2
Q

Préparation de coupes fines simples.

A

FAUX.
Préparation de coupes ULTRAfines.
(30nm)

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3
Q

Préparation =
Fixation : tétraxyde d’Osmiun (OsO4)
Résine épom (époxy)
Ultramicrotome
Contraste aux métaux lourds (Pb, U, Au,…)
(Opaques électroniques)

A

VRAI.

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4
Q

Cryofracture :
Congélation
Fracture mécanique
Ombrage mécanique
Observation directe (MET)

A

VRAI.

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5
Q

Cryodécapage :
Cryofacture
Sublimation sous vide
Observation de répiques (MET)

A

VRAI.

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6
Q

MEB =
faisceau 1er
Ombrage métallique
Rayonnement 2re
Écran cathodique

A

VRAI.

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7
Q

MET : traverse direct / MEB : traverse 2 fois

A

VRAI.

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8
Q

Microscope à force atomique/effet tunnel = mesure d’interaction de surface.

A

VRAI.

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