Fu Chun Yu Lab Notebooks

11/17/50

24.043 gms of triply distilled water was added to 4.225 gms MnSO₄·H₂O to form 25 cc. 1. Molar MnSO₄ solution

Percent H₂O in this solution = 97.9%

1/19/50

4.256 g. 99.5% D₂O was added to 0.507 g. MnSO₄·H₂O to form a 4 cc. solution.

Molarity of MnSO₄ = 3/4 Volume of D₂O - 3.830 cc Molarity of H = 1.28

11/22/50

Magnet control power supply

11/22/50

REGULATOR

11/23/50

Proton resonances from the following two samples were compared under identical conditions:

Sample volume = 4 cc Molarity of Mn⁺⁺ = 0.75 Gain = 60 H_s = 0.086 G H₁ = 1 1/2 cell ~ 0.089 G Rate = D H₀ ~ 1500 G

(a) 4.256 g 99.5 % D₂O was added to 0.507 g. MnSO₄·H₂O to form 4 cc solution. It contains H to 1.28 M (b) 4 cc. of 0.75 M Mn⁺⁺ in H₂O

Size of signal from sample (a) = 65.1

" " " " " (b) = 13.5 (attenuated to a factor 1/200)

Conclusion: [illegible] If attentuation factor is correct, % purity of D₂O is 98.2%

11/27/50

Be (NO₃)₂ 0.51 M + 4 M MnCl₂ H_s = 0.085 G

No. of cells	H₁	Signal Amplitude
1/2	-	21.9 ± 2.7
1	-	51.4 ± 1.3
1 1/2	-	58.0 ± 3.3
2	-	44.1 ± 1.4
2 1/2	-	25.7 ± 5.1
3	-	16.5 ± 1.8

12/1/50

Resonance frequency of O¹⁷

Sample: enriched H₂O¹⁷ without paramagnetic catalyst

O¹⁷ (5820 --> 5800 KC)

Time	Distance bet. markers	marker	Resonance distance	Resonance frequency	Δν	Δν²
16 min	39.0 mm	#1	8.5 mm	58 & 5.8 KC	.1	.01
47	39.5	"	8.8	58 & 5.7	.2	.04
79	38.0	"	7.8	58 & 6.0	.1	.01
103	38.5	"	7.8	58 & 6.0	.1	.01

D² (6600 --> 6580 KC)

4 min	30.0 mm	# 1	22.0 mm	6585.4 KC	.15	.0225
36	29.0	"	21.0	6585.6	.05	.0025
72	30.0	"	22.0	6585.4	.15	.0225
93	29.5	"	21.0	6585.8	.25	.0625

12/5/50

weight of bottle = 21.800 g " " 1 ml D₂O = 1.120 g

weight of MnSO₄·H₂O = 16.9 g

29.3 20 cc of H₂O added to form 100/3 cc solution

Saturation expt of O¹⁷ resonance with a sample of enriched H₂O¹⁷ in 0.00019 M MnSO₄ solution

No. of cells	H₁	Signal amplitude
1/2	0.022	18.5
1	0.053	33.5
1 1/2	0.089	39
2	0.134	39.5
2 1/2	0.174	34
3	0.218	23

H_s = 0.086 G G ~ 65

Assume saturation occurs at H₁ = 0.1

x	H₁	SIG AMP
0.2	0.0283 G	0.51 x 40
0.4	0.0566	0.864
0.6	0.0849	1.025
0.707	-	1.04
0.8	0.113	1.027
1.0	0.142	0.96
1.2	0.169	0.851
1.4	0.198	0.74
1.6	0.226	0.641

Saturation expt of D² resonance with sample of 3.38 N D₂O + 3 M MnSO₄

G ~ 55

No. of cells	H₁	Sig Amp
1/2	0.022 G	19
1	0.053	41.5
1 1 /2	0.089	61.5
2	0.134	74
2 1/2	0.174	81
3	0.218	90
3 1/2	0.268	89
4	0.316	88

Assume saturation occurs at H₁=0.225G

x	H₁	SIG AMP
0.1	0.0312	214
0.2	0.0624	4.55
0.3	0.936	6.34
0.4	0.125	7.70
0.6	0.187	9.15
0.8	0.250	9.17
1.0	0.312	8.57
1.2	0.374	7.60

12/10/50

The siqnal amplitudes & width of O¹⁷ & D² resonances were compared at the same magnetic field

O¹⁷ Height = 41.7 ± 2.6 , Width = 40.0 ± 2.4 enriched H₂O¹⁷ +0.00019M MnSO₄

D² 1.20N D²O Height = 82 ± 4 Width = 66 ± 4 +3M MnSO₄

a ≡ amplitude

I (I+1) n γ³ / ΔH² ------------------------------------------------------------ I_D(I_D+1) n_D γ³_D / ΔH²_D

= a ----- a_D

I(I+1) = I_D(I_D+1)(n_D / n)(γ_D / γ)³ {aΔH² / a_DΔH²}

= 2x 1.70/0.1 x 1.45 x 42x40²/82x66² (1+14.5%) x 0.96 correction factor for difference in rates

=8.90 (1+14.5%)

I = 2.52 ± 0.[?] % abundance of O¹⁷ = 0.18 Molarity of O¹⁷ = 55.55 x 0.18 = 0.1