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CHEM313 > LC Introduction to Magnetochemistry > Flashcards

LC Introduction to Magnetochemistry Flashcards

1
Q

what is the symbol for magnetic field

A

H

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2
Q

what is magnetic force proportional to

A

p1*p2/r^2

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3
Q

how is magnetic force associated with pole strength

A

H=1/4pi * p/r^2

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4
Q

what is the magnetic constant

A

mu0 = 4pi x 10^-7

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5
Q

what values can quantum number n have

A

any integer

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6
Q

what values can quantum number l have

A

any integer up to (n-1)

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7
Q

what values can quantum number ml have

A

between l and -l

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8
Q

what does the principle quantum number represent

A

electron energy

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9
Q

what does orbital angular momentum quantum number represent

A

orbital angular momentum of electron

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10
Q

magnetic quantum number

A

allowed orientations

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11
Q

what is the formula for magnetic moment

A

u1=gamma L

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12
Q

what is gamma

A

gyromagnetic ratio

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13
Q

what does the gyromagetic ratio account for

A

charge and mass

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14
Q

what is the formula for magnitute of the magnetic moment

A

|u1| = root(l(l+1)uB)

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15
Q

what is a bohr magneton

A

elementary unit of orbital magnetic moment of an electron

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16
Q

what is the formula for spin angular momentum

A

us = gs gamma s

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17
Q

what does S equal in us = gs gamma s

A

spin angular momentum

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18
Q

what is the formula of themagnitude of the spin magnetic moment

A

|us| =gs root(s(s+1)) uB

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19
Q

define magnetisation

A

total magnetic moment by volume

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20
Q

what is the the formula for magnetic induction (B)

A

B=u0(H+M)

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21
Q

what are the SI units of H

A

Am-1

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22
Q

what are the SI units of B

A

T

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23
Q

M

A

Am-1

24
Q

what is magnetic susceptibility

A

how responsive a material is to an applied magnetic field

25
Q

what is the formula for magnetic suseptibility

A

X=M/H

26
Q

what the 2 types magnetic suseptibility

A

diamagnetic and paramagnetic

27
Q

what is diamagnetism

A

no unpaired e

28
Q

what effects are caused by diamagnetism

A

negative susceptablity

responce seen in applied field

29
Q

what is an application of diamagentism

A

magnetic levitation

30
Q

when does paramagnetism occur

A

contains unpaired electrons

31
Q

what effects are caused by paramagnetism

A

random allignment

weak attraction to magnetic field

32
Q

paramagnet vs ideal gas

A

PV = nRT

HM proportional to T

33
Q

what does curies law show and what is the formula

A

T dependence of magnetic susceptibility Xm=C/T

34
Q

how can curies constant be determined

A

1/Xm = T/C C = 1/grad

35
Q

how is effective magnetic moment related to C

A

ueff = 797.8 root(C) uB

36
Q

what does the brillouin function

A

plot of M vs. H - plateaus at Msat

37
Q

give some applications of paramagnets

A

change in entropy upon magnetisation

38
Q

what is spin angular coupling

A

when orbital and spin angular momentum couple to form total angular momentum (J)

39
Q

what is the effective magnetic moment equal to

A

ueff = gj root(J(J+1))uB

40
Q

what is the formula for the lande g factor

A

gj = 3/2 + (S(S+1)-L(L+1)/2J(J+1)

41
Q

what is the effective magnetic moment

A

total magnetic moment of all unpaired electrons

42
Q

what is the saturated magnetic moment

A

in very large fields the splitting of energy states is so large that all magnetic moments reside in the lowest energy state

43
Q

what is the formula of usat

A

usat = gjJuB

44
Q

what is hunds rule

A

allowed J values = |L+S| ………….L+S

45
Q

how to arrange electrons for term symbols

A 
maximise S (try not to pair)
maximise L
46
Q

how to calculate J for term symbols

A

less than half = |L-S|

more than half = L+S

47
Q

how is the term symbol letter determines

A

as the letter for L (s,p,d,f,g,h,l)

48
Q

what energy levels does hunds rule account for

A

ground state only

49
Q

why does hunds rule not work well for 3d

A

assumes spin orbit coupling is 2nd most important energy - ^oct has greater effect for 3d
- L = 0 for 3d

50
Q

why is the spin only formula used for 3d applications of hunds rules

A

L=0 for 3d

51
Q

what is the spin only formula for ueff

A

ueff = 2 root(S(S+1))uB

52
Q

what is the spin only formula for usat

A

usat = 2SuB

53
Q

when does orbital angular momentum occur

A

when an electron can move to another 90 degrees to its own

54
Q

what are the term symbols for 3d metals

A 
T = t2g not full or half full
E = eg not full or half full
A = t2g or eg full or half full
55
Q

what is the relationship between magnetic moment and T

A

depends on T

56
Q

how are ueff values calcuated for perovskites

A

root(ueff[A]^2 + ueff[B]^2)

CHEM313 (5 decks)

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