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2Â¥2010-12-15 22:50:10
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ÈôËùÓзÖ×ÓÔÚ¾ø¶ÔÁã¶ÈʱìØÎªÁãµÄ»°£¬ÎÒ¼ÆËãÁËÒ»ÏÂÒÒÍéÔÚÔÚ½Ó½ü¾ø¶ÔÁã¶Èʱ£¨0.001K£¬1.0 atm £©Ê±µÄìØ£¬È´³öÏÖÁ˸ºÖµ£¬ÕâÊÇÎªÊ²Ã´ÄØ? ²¿·ÖÊä³ö½á¹ûÈçÏ£¬ÏêϸÊä³öÎļþ¼û¸½¼þhttp://d.namipan.com/d/be753ea92 ... 39c4feef9f628850100 ------------------- - Thermochemistry - ------------------- Temperature 0.001 Kelvin. Pressure 1.00000 Atm. Atom 1 has atomic number 6 and mass 12.00000 Atom 2 has atomic number 1 and mass 1.00783 Atom 3 has atomic number 1 and mass 1.00783 Atom 4 has atomic number 1 and mass 1.00783 Atom 5 has atomic number 6 and mass 12.00000 Atom 6 has atomic number 1 and mass 1.00783 Atom 7 has atomic number 1 and mass 1.00783 Atom 8 has atomic number 1 and mass 1.00783 Molecular mass: 30.04695 amu. Principal axes and moments of inertia in atomic units: 1 2 3 EIGENVALUES -- 22.50754 90.72976 90.73040 X 1.00000 0.00000 0.00000 Y 0.00000 1.00000 0.00000 Z 0.00000 0.00000 1.00000 This molecule is an asymmetric top. Rotational symmetry number 1. Rotational temperatures (Kelvin) 3.84821 0.95464 0.95463 Rotational constants (GHZ): 80.18384 19.89139 19.89125 Zero-point vibrational energy 197533.4 (Joules/Mol) 47.21161 (Kcal/Mol) Vibrational temperatures: 449.61 1197.14 1197.72 1453.03 1777.62 (Kelvin) 1778.20 2062.27 2092.39 2203.85 2204.29 2211.96 2212.65 4384.44 4386.18 4458.40 4458.62 4493.50 4493.68 Zero-point correction= 0.075236 (Hartree/Particle) Thermal correction to Energy= 0.075237 Thermal correction to Enthalpy= 0.075237 Thermal correction to Gibbs Free Energy= 0.075237 Sum of electronic and zero-point Energies= -79.755183 Sum of electronic and thermal Energies= -79.755183 Sum of electronic and thermal Enthalpies= -79.755183 Sum of electronic and thermal Free Energies= -79.755183 E (Thermal) CV S KCal/Mol Cal/Mol-Kelvin Cal/Mol-Kelvin Total 47.212 5.962 -44.209 Electronic 0.000 0.000 0.000 Translational 0.000 2.981 -26.490 Rotational 0.000 2.981 -17.719 Vibrational 47.212 0.000 0.000 |
3Â¥2010-12-15 23:14:08
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4Â¥2010-12-16 09:58:40
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5Â¥2010-12-16 13:04:10
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Based on my understanding, computational programms have numerical error and limitations. Sometimes when a program takes a "BAD" variable (e.g. too closed to 0), it could not function normally. Gaussian might do the same, its entropy calculation might be good for most of cases (like 1K-9999K probabally), but it is not suitable for a very small T like 0.001, which won't affect its usage much.. I was talking to my self.. again.. |
6Â¥2010-12-16 14:37:45
coolrainbow
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freesea(½ð±Ò+1): 2010-12-16 23:23:16
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freesea(½ð±Ò+1): 2010-12-16 23:23:16
Сºì¶¹(½ð±Ò+2):¹ÄÀø½»Á÷ 2010-12-17 10:01:19
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Gaussian¼ÆËãµÄÊÇÀíÏëÆøÌåÄ£Ð͵Äentropy£¬¼´Ê¹ÊÇ0.001K£¬Æ½¶¯ìغÍת¶¯ìؾßÓÐÏ൱´óµÄ¸ºÖµ£¬¾ÍÊÇÄãËù¿´µ½µÄ¡£µ±ÉèΪ0Kʱ£¬Æ½¶¯ìغÍת¶¯ÉÏ»áÊÇÎÞÇî´óµÄ¸ºÖµ |
7Â¥2010-12-16 17:01:31
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freesea(½ð±Ò+1): 2010-12-16 23:22:32
Сºì¶¹(½ð±Ò+3):¹ÄÀø½»Á÷ 2010-12-17 10:01:32
freesea(½ð±Ò+1): 2010-12-16 23:22:32
Сºì¶¹(½ð±Ò+3):¹ÄÀø½»Á÷ 2010-12-17 10:01:32
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¡¾ÉÌȶ¡¿¼´Ê¹¶ÔÀíÏëÆøÌ壬ÔÚζȺܵÍʱGaussianµÄ¼ÆËã½á¹ûÒ²ÊÇ´íÎóµÄ¡£ÒòΪGaussian¶ÔÓÚÆ½¶¯ìغÍת¶¯ìصļÆËãÖÐʹÓÃÁËÅä·Öº¯Êý£¬²Î¼û http://www.gaussian.com/g_whitepap/thermo.htm ¶øÓйصÄÅä·Öº¯ÊýµÄ±í´ïʽÔò²ÉÓÃÁ˾µä½üËÆ£¬ÕâÖÖ½üËÆÔÚζȺܵÍʱ²¢²»³ÉÁ¢¡£×ÈÒÔÆ½¶¯ÎªÀý£¬Æä¾µä½üËÆÌõ¼þΪ (V/N)^(1/3) >> h/(3mkT)^(1/2) [²Î¼û£ºÖìÎĺƣ¬¹ËعÇß±àÖø£¬¡¶Í³¼ÆÎïÀíѧ»ù´¡¡·£¬Ç廪´óѧ³ö°æÉ磬192Ò³] ʽÖÐVΪÌå»ý£¬NΪ·Ö×ÓÊý¡£ÏÔÈ»£¬µ±TÇ÷ÓÚ0Kʱ£¬ÉÏÊö½üËÆÌõ¼þʧЧ¡£Òò´ËÓйصĹ«Ê½²»ÄÜÓÃÓÚζȺܵ͵ÄÇé¿ö£¬·ñÔò»á³öÏÖÐí¶àÆæ¹ÖµÄÊ¡£ °´Àí˵£¬ÔÚ´ËÖÖÇé¿öÏÂGaussianÓ¦¸Ã¸ø³ö¾¯¸æ£¬µ«Òź¶µÄÊÇËü²¢Ã»Óиø³öÕâÖÖ¾¯¸æ¡£Òò´Ë£¬Èç¹û°ÑGaussianÍêÈ«µ±×öºÚÏäÀ´ÓÃÊǺÜΣÏյġ£ |
8Â¥2010-12-16 21:08:21
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quote]Originally posted by coolrainbow at 2010-12-16 17:01:31: Gaussian¼ÆËãµÄÊÇÀíÏëÆøÌåÄ£Ð͵Äentropy£¬¼´Ê¹ÊÇ0.001K£¬Æ½¶¯ìغÍת¶¯ìؾßÓÐÏ൱´óµÄ¸ºÖµ£¬¾ÍÊÇÄãËù¿´µ½µÄ¡£µ±ÉèΪ0Kʱ£¬Æ½¶¯ìغÍת¶¯ÉÏ»áÊÇÎÞÇî´óµÄ¸ºÖµ [/quote] Çë½ÌÄúһϣ¬²»Í¬·Ö×ÓìØµÄ¼ÆËã»ù×¼Ò»ÑùÂð£¿ÈôÎÒ¼ÆËãÁ˲»Í¬·Ö×ÓÔÚ298.15K 1.0atm ʱµÄìØ£¬·¢ÏÖ½á¹ûA·Ö×ÓµÄÖµ±ÈB·Ö×ÓµÄÖµ´ó£¬ÔòÄÜ˵Ã÷A·Ö×ӵľø¶ÔìØ±ÈB·Ö×Ó´óô£¿Ð»Ð»~~ |
9Â¥2010-12-16 23:39:22
coolrainbow
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10Â¥2010-12-17 08:37:53
coolrainbow
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- Ó¦Öú: 1 (Ó×¶ùÔ°)
- ¹ó±ö: 0.1
- ½ð±Ò: 3979.5
- Ìû×Ó: 1137
- ÔÚÏß: 272.3Сʱ
- ³æºÅ: 239560
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Сºì¶¹(½ð±Ò+2):¹ÄÀø½»Á÷ 2010-12-17 10:02:35
freesea(½ð±Ò+1):лл½â´ð 2010-12-17 22:58:29
Сºì¶¹(½ð±Ò+2):¹ÄÀø½»Á÷ 2010-12-17 10:02:35
freesea(½ð±Ò+1):лл½â´ð 2010-12-17 22:58:29
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11Â¥2010-12-17 08:43:19
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